CN111520292B - Method for enhancing compression resistance of sandwich material - Google Patents
Method for enhancing compression resistance of sandwich material Download PDFInfo
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- CN111520292B CN111520292B CN202010218300.2A CN202010218300A CN111520292B CN 111520292 B CN111520292 B CN 111520292B CN 202010218300 A CN202010218300 A CN 202010218300A CN 111520292 B CN111520292 B CN 111520292B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three dimensional structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
- B29C70/745—Filling cavities in the preformed part
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/082—Blades, e.g. for helicopters
- B29L2031/085—Wind turbine blades
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a method for enhancing the compression resistance of a sandwich material, which is to open a path in a sandwich plate for placing fiber bundles, after the impregnation process, a vertical fiber column-glued fiberglass fabric, an oblique fiber column-glued fiberglass fabric, a longitudinal fiber reinforced fiberglass fabric and a transverse fiber reinforced fiberglass fabric can be formed in the sandwich board fiberglass fabric, and the oblique fiber glue column glass fiber fabric, the longitudinal fiber glue reinforcement glass fiber fabric and the transverse fiber glue reinforcement glass fiber fabric form a crisscross grid surrounding glass fiber fabric which is longitudinally and transversely interwoven and integrally bonded in the sandwich board, meanwhile, the glass fiber fabric is pasted on the upper surface and the lower surface of the glass fiber fabric of the sandwich plate before gum dipping to form an integral framework formed by bonding the glass fiber fabric, the vertical fiber glue column glass fiber fabric and the groined fence glass fiber fabric, so that the compression-resistant sandwich material capable of bearing multidirectional pressure is manufactured.
Description
Technical Field
The invention relates to a sandwich material for a wind power blade, in particular to a method for enhancing the pressure resistance of the sandwich material, and belongs to the technical field of wind power composite material structures.
Background
At present, the blade root area of the wind power blade shell is mainly structurally designed by balsa wood, and the normal performance of the balsa wood is excellent, so that the PET foam with different densities or doubled densities can be compared. However, the light wood supply is tense at present, the production delivery plan is seriously influenced by the light wood supply, meanwhile, the uncontrollable performance of the light wood caused by natural growth gradually shows in the period, the defects of mildewing, rotting and the like cannot be identified in percentage to cause perfusion defects, and the repair cost is increased. Compared with the prior art, the sandwich foam has stable and controllable performance by controlling raw materials and foaming process. High density PET/HPE/PVC foam is considered to replace balsa wood. Through performance test of PET/HPE/PVC foam in the density range of 100-220Kg/m, the main difference is found to be the difference of normal compression resistance and multiple differences, if higher density foam is selected, the cost performance is not high, and the influence on the weight and mass distance of the blade is great. Therefore, the sandwich material with excellent overall mechanical property, especially excellent compression resistance is obtained by taking bottom density foam as a support body, arranging a fiber three-dimensional structure through punching and slotting, and then dipping and coagulating.
Through search, the patent publication (publication) No. CN105479772A and publication (publication) No. CN106494022A and publication (publication) No. 2016.04.13, the patent publication (publication) No. CN106494022A and publication (publication) No. 2017.03.15 are the closest to the present invention, but as can be seen from the technical contents disclosed in the two patent documents, the reinforcing structures on the upper layer and the lower layer of the foam board are tensioned by the bendable fiber yarns or threads, and the longitudinal tensile property, the transverse tensile property and the normal tear resistance of the sandwich material are well solved by the structure. However, the bendable fiber yarns or threads do not have compressive strength and penetrate through the foam material in a needle penetration traction mode, no gap or small gap exists between the threads or the fiber yarns penetrating through the foam board and the foam material, the glue solution cannot be immersed along the threads or the fiber yarns during gum dipping, and glue columns with compressive strength cannot be formed around the threads or the fiber yarns after condensation, so that the whole sandwich material is lack of mechanical properties of normal compressive strength.
Disclosure of Invention
The technical problems to be solved by the invention are mainly as follows: the sandwich material shows poor compression resistance to the force applied on the plate surface of the sandwich material plate in all directions.
Aiming at the problems, the technical scheme provided by the invention is as follows:
a method for enhancing the compression resistance of sandwich material is to use the glass fiber fabric of sandwich plate as a support and construct a compression-resistant mechanical integral structure capable of bearing multidirectional pressure inside and outside the glass fiber fabric of sandwich plate.
Furthermore, a compressive mechanical integral structure capable of bearing multidirectional force is constructed in the sandwich panel glass fiber fabric, fiber bundles are placed in an open path in the sandwich panel, after a glue dipping process is performed, a vertical fiber glue column glass fiber fabric, an oblique fiber glue column glass fiber fabric, a longitudinal fiber glue rib glass fiber fabric and a transverse fiber glue rib glass fiber fabric can be formed in the sandwich panel glass fiber fabric, the oblique fiber glue column glass fiber fabric, the longitudinal fiber glue rib glass fiber fabric and the transverse fiber glue rib glass fiber fabric form a crisscross grid surrounding glass fiber fabric which is interwoven into a whole in a crisscross mode and is bonded in the sandwich panel, and meanwhile, the glass fiber fabric glass fiber fabrics which are bonded on the upper surface and the lower surface of the sandwich panel glass fiber fabric before glue dipping are utilized to form an integral framework which is formed by bonding the glass fiber fabric glass fiber fabrics, the vertical fiber glue column glass fiber fabric and the crisscross grid surrounding glass fiber fabric.
Furthermore, the oblique fiber glue column glass fiber fabric, the longitudinal fiber glue rib glass fiber fabric and the transverse fiber glue rib glass fiber fabric form criss-cross interwoven integrated bonded grid-surrounding glass fiber fabrics in the sandwich panel, two transversely adjacent oblique fiber glue column glass fiber fabrics in the sandwich panel glass fiber fabrics are bonded on two sides of the longitudinal fiber glue rib glass fiber fabric in an X shape, two longitudinally adjacent oblique fiber glue column glass fiber fabrics in the sandwich panel glass fiber fabrics are bonded on two sides of the transverse fiber glue rib glass fiber fabric in an X shape, and meanwhile, the adjacent longitudinal fiber glue rib glass fiber fabrics and the transverse fiber glue rib glass fiber fabrics are bonded.
Further, the placing path of each fiber bundle for manufacturing the mechanical structure is set to be an independent placing path, and the placing path of the oblique fiber bundle is communicated with the placing path of the adjacent longitudinal fiber bundle or the placing path of the transverse fiber bundle.
Furthermore, the fiber bundle placing path is that a plurality of orthogonal longitudinal slit glass fiber fabrics and transverse slit glass fiber fabrics are equidistantly arranged on the sandwich plate glass fiber fabric, and the sandwich plate glass fiber fabric is divided into a plurality of sandwich square glass fiber fabrics with connected bottoms; vertical hole glass fiber fabrics are punched downwards on the glass fiber fabrics of the sandwich square block, and oblique hole glass fiber fabrics are punched downwards at the edge parts of 4 edges of the sandwich square block along the front glass fiber fabric, the left side glass fiber fabric, the rear glass fiber fabric and the right side glass fiber fabric respectively.
Furthermore, the inclined hole glass fiber fabrics respectively punched downwards along the front glass fiber fabric, the left side glass fiber fabric, the rear glass fiber fabric and the right side glass fiber fabric are all provided with chordally cut notch glass fiber fabrics for glue passing on the surfaces where the inclined hole glass fiber fabrics are arranged.
Further, according to the clockwise direction, the inclined directions of the inclined hole glass fiber fabrics on the front glass fiber fabric, the left side glass fiber fabric, the back glass fiber fabric and the right side glass fiber fabric are consistent, so that the inclined directions of the inclined hole glass fiber fabrics on two adjacent surfaces of two adjacent sandwich square glass fiber fabrics on the sandwich plate glass fiber fabric are opposite, and the projections of the two inclined hole glass fiber fabrics are crossed in an X shape.
Furthermore, the oblique hole glass fiber fabric and the vertical hole glass fiber fabric are holes which are communicated up and down on the sandwich square glass fiber fabric.
The method for enhancing the compression resistance of the sandwich material comprises the following steps:
1) cutting the longitudinal slit glass fiber fabric and the transverse slit glass fiber fabric on the sandwich plate glass fiber fabric, and dividing the sandwich plate glass fiber fabric into a plurality of sandwich square glass fiber fabrics; punching a vertical hole glass fiber fabric and an oblique hole glass fiber fabric on the sandwich square;
2) placing fiber bundles in the longitudinal slit glass fiber fabric, the transverse slit glass fiber fabric, the vertical hole glass fiber fabric and the oblique hole glass fiber fabric in the step 1;
3) bonding permeable and easily-cut glass fiber fabrics on the upper and lower surfaces of the sandwich plate glass fiber fabrics, and restraining the fiber bundles placed in the step 2 in the sandwich plate glass fiber fabrics;
4) when the glass fiber fabric needs to be applied, the glass fiber fabric of the sandwich panel manufactured in the step 3 is subjected to gum dipping and curing; or directly dipping and curing the glass fiber fabric of the sandwich panel manufactured in the step 3 for later use.
Further, in the step 2), fiber bundles are placed in the longitudinal slit glass fiber fabric and the transverse slit glass fiber fabric in an alternate stacking mode, namely, a layer of longitudinal fiber bundles are placed, a layer of transverse fiber bundles are placed, and the process is repeated.
The invention has the advantages that: because the sandwich material is provided with the oblique fiber glue column (4) and the normal fiber glue column in multiple directions, the compression resistance of the surface of the sandwich material plate is obviously enhanced; because the slots are vertically and horizontally arranged on the surface of the sandwich material plate and the woven silk gel is laminated in the longitudinal slots and the transverse slots, the tensile property of the sandwich material plate in all directions is obviously enhanced.
Drawings
FIG. 1 is a schematic perspective view of a sandwich panel according to the present invention;
FIG. 2 is a schematic perspective view of a sandwich block;
FIG. 3 is an exploded view of three adjacent sandwich blocks in the sandwich panel;
FIG. 4 is a partial schematic view of FIG. 1, in which the outer circle is the cutting boundary of the original drawing, not the structure of the present invention;
FIG. 5 is a schematic diagram of a fence structure built by oblique fiber rubber columns, longitudinal fiber rubber ribs and transverse fiber rubber ribs;
FIG. 6 shows vertical fiber glue columns distributed in the sandwich blocks;
FIG. 7 is a groined fence constructed by oblique fiber rubber columns, longitudinal fiber rubber ribs and transverse fiber rubber ribs;
FIG. 8 is a sandwich panel to which a glass fiber fabric has been applied, but which has not been impregnated;
FIG. 9 is a schematic view of a sandwich material with enhanced compression resistance after gum dipping, which is manufactured according to the present invention.
In the figure: 1. a sandwich panel; 2. a sandwich square block; 21. a front face; 22. a left side surface; 23. a rear side; 24. a right side surface; 3. vertical fiber glue columns; 4. oblique fiber glue columns; 5. longitudinal fiber rubber ribs; 6. transverse fiber rubber ribs; 7. a groined fence is arranged; 8. a glass fiber fabric; 9. longitudinally cutting a seam; 10. transversely cutting a seam; 11. a vertical hole; 12. an oblique hole; 121. a front oblique hole; 122. a left oblique hole; 123. a rear oblique hole; 124. a right angled hole; 13. cutting a notch in a string; 14. a vertical fiber bundle; 15. oblique fiber bundles; 16. a longitudinal fiber bundle; 17. transverse fiber bundles.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, a method for enhancing the compression resistance of a sandwich material, a sandwich plate 1 is used as a supporting body, and a compression mechanical integral structure capable of bearing multidirectional pressure is constructed inside and outside the sandwich plate 1. The sandwich board 1 is a foam board, has very low compression and tensile mechanical properties, is easy to cut and punch, can be used for freely building various frame bodies in the board to form a good support body, has light weight, and can be used for replacing balsa wood materials to form qualified sandwich materials in the blade root area of the wind power blade shell after being built into a compression mechanical integral structure.
As shown in fig. 1, 6, 7, and 8, the compressive mechanical overall structure capable of bearing multidirectional force is constructed in the sandwich panel 1, a fiber bundle is placed in an open path in the sandwich panel, after a glue dipping process is performed, a vertical fiber glue column 3, an oblique fiber glue column 4, a longitudinal fiber glue rib 5, and a transverse fiber glue rib 6 can be formed in the sandwich panel 1, the oblique fiber glue column 4, the longitudinal fiber glue rib 5, and the transverse fiber glue rib 6 form a crisscross grid enclosure 7 which is vertically and horizontally interwoven and integrally bonded in the sandwich panel, and simultaneously, a glass fiber fabric 8 arranged on the upper surface and the lower surface of the sandwich panel 1 before glue dipping is used to form an overall framework formed by bonding the glass fiber fabric 8, the vertical fiber glue column 3, and the crisscross grid enclosure 7. It is apparent that the vertical fiber gel columns 3 function in the structure to directly resist the positive pressure applied to the sandwich panel 1. However, since the pressure applied to the panel is a force in various directions in addition to the positive pressure, the oblique fiber gel column 4 is provided in the structure. The longitudinal fiber rubber ribs 5 and the transverse fiber rubber ribs 6 mainly have the functions of bonding all the oblique fiber rubber columns 4 on an integral framework through glue solution, so that the stability of each oblique fiber rubber column 4 under pressure can be enhanced, and the compression resistance of the sandwich panel 1 against the pressure in all directions can be obviously enhanced. Secondly, the longitudinal fiber rubber ribs 5 and the transverse fiber rubber ribs 6 obviously enhance the tensile property of the sandwich panel 2 in the horizontal direction. The groined fence 7, as shown in fig. 7, is actually only a part of the mechanical overall structure constructed in the sandwich panel 2.
As shown in fig. 1, 5 and 7, the oblique fiber glue columns 4, the longitudinal fiber glue bars 5 and the transverse fiber glue bars 6 form criss-cross grid barriers 7 which are interwoven into a whole and bonded vertically and horizontally in the sandwich panel, two oblique fiber glue columns 4 which are adjacent horizontally in the sandwich panel 1 are bonded to two sides of the longitudinal fiber glue bars 5 in an X shape, two oblique fiber glue columns 4 which are adjacent vertically in the sandwich panel 1 are bonded to two sides of the transverse fiber glue bars 6 in an X shape, and meanwhile, the longitudinal fiber glue bars 5 and the transverse fiber glue bars 6 which are adjacent to each other are bonded to each other.
It should be noted here that the vertical fiber glue column 3, the oblique fiber glue column 4, the longitudinal fiber glue rib 5, and the transverse fiber glue rib 6 are formed, the oblique fiber glue column 4, the longitudinal fiber glue rib 5, and the transverse fiber glue rib 6 form a crisscross fence 7 in the sandwich board, which is vertically and horizontally interwoven and integrally bonded, and the integral framework formed by bonding the glass fiber fabrics 8 arranged on the upper surface and the lower surface with the vertical fiber glue column 3 and the crisscross fence 7 is actually formed by one-time glue dipping and is not formed by multiple times of glue dipping according to steps.
As shown in fig. 4, the placing path of each fiber bundle for manufacturing the mechanical structure is set as an independent placing path, that is, the placing paths of each fiber bundle do not have a common intersection point, so that the placing of one fiber bundle can be prevented from obstructing the placing of another fiber bundle; and communicates the laying path of the diagonal fiber bundle 15 with the laying path of the adjacent longitudinal fiber bundle 16 or the laying path of the transverse fiber bundle 17. The effect of this arrangement is to glue the bond because each oblique fiber bundle is bonded to the longitudinal fiber bundle or the transverse fiber bundle.
As shown in fig. 1-4, the fiber bundle is laid on the sandwich panel 1 by forming a plurality of orthogonal longitudinal slits 9 and transverse slits 10 at equal intervals, and dividing the sandwich panel 1 into a plurality of sandwich blocks 2 with connected bottoms; vertical holes 11 are drilled downwards on the sandwich block 2, and inclined holes 12 are drilled downwards on the edge parts of 4 sides of the sandwich block along the front surface 21, the left side surface 22, the rear surface 23 and the right side surface 24 respectively. The distribution and number of the vertical holes 11 on the sandwich block are not limited as long as the vertical holes do not intersect with the oblique holes. Generally, only one oblique hole is drilled at each edge part of 4 sides of the sandwich square block, and a plurality of oblique holes can be drilled at special requirements, but the oblique holes 12 can not be intersected. Referring to fig. 1 and 4, the vertical hole 11 and the vertical fiber bundle 14 disposed therein, the diagonal hole 12 and the diagonal fiber bundle 15 disposed therein, the longitudinal fiber bundle 16 disposed in the longitudinal slit 9, and the transverse fiber bundle 17 disposed in the transverse slit 10 are shown, respectively.
As shown in fig. 2, the inclined holes 12 punched downwards along the front surface 21, the left side surface 22, the rear surface 23 and the right side surface 24 are all provided with chordal notches 13 for passing glue.
As shown in fig. 1-3, the inclined directions of the inclined holes 12 on the front surface 21, the left side surface 22, the back surface 23 and the right side surface 24 are consistent in a clockwise direction, so that the inclined directions of the inclined holes 12 on the two adjacent surfaces of two adjacent sandwich blocks 2 on the sandwich panel 1 are opposite, and the projections of the two inclined holes 12 are crossed in an X shape. To more clearly illustrate the above problem, referring to FIG. 3 in conjunction with FIG. 2, two sandwich blocks 2 adjacent in front and back (or adjacent in transverse direction), wherein the inclined directions of the back inclined holes 123 of the front sandwich block 2 are opposite to the inclined directions of the front inclined holes 121 of the back sandwich block 2, and the transverse orthogonal projections are crossed in an X shape; the right oblique holes 124 of the left sandwich block 2 and the left oblique holes 122 of the right sandwich block 2 are opposite in inclination direction, and the longitudinal orthographic projections of the two sandwich blocks 2 adjacent to each other (or longitudinally adjacent) are crossed in an X shape. For the sake of easy observation, the distance between 3 sandwich blocks 2 in fig. 3 is separated, and in practice, the width of the slit between two adjacent sandwich blocks 2 of the product of the invention is generally only about 1 mm.
As shown in fig. 1, 8 and 9, the inclined holes 12 and the vertical holes 11 are all holes that penetrate through the sandwich block 2 from top to bottom. The reason for this is that the transverse fiber rubber ribs 6 and the oblique fiber rubber columns 4 formed in the oblique holes 12 and the vertical holes 11 are bonded with the glass fiber fabrics 8 arranged on the upper top surface and the lower bottom surface of the sandwich panel 1 through glue.
The method for enhancing the compression resistance of the sandwich material comprises the following steps:
1) cutting a longitudinal cutting seam 9 and a transverse cutting seam 10 on the sandwich panel 1, and dividing the sandwich panel 1 into a plurality of sandwich squares 2; drilling a vertical hole 11 and an oblique hole 12 on the sandwich square block;
2) placing fiber bundles in the longitudinal joint cuts 9, the transverse joint cuts 10, the vertical holes 11 and the oblique holes 12 in the step 1;
3) adhering permeable and easily-cut glass fiber fabrics on the upper surface and the lower surface of the sandwich plate 1 (refer to fig. 8), and restraining the fiber bundles placed in the step 2 in the sandwich plate 1;
4) when the sandwich panel 1 is required to be applied, gum dipping and curing are carried out on the sandwich panel 1 manufactured in the step 3; or directly dipping and curing the sandwich panel 1 manufactured in the step 3 for later use (refer to fig. 9).
As shown in fig. 5, the fiber bundles are placed in the longitudinal slits 9 and the transverse slits 10 in the step 2 in an alternating manner, i.e., a layer of longitudinal fiber bundles 16 is placed and a layer of transverse fiber bundles 17 is placed, and the process is repeated.
1 processing the blade into a required shape, and filling the blade into a blade shell before dipping and curing.
As shown in fig. 1, 6, 7 and 8, by the above measures, the fiber bundle and the glue solution in the vertical hole 11 are coagulated into the vertical fiber glue column 3, the fiber bundle and the glue solution in the oblique hole 12 are coagulated into the oblique fiber glue column 4, the fiber bundle and the glue solution in the longitudinal joint seam 9 are coagulated into the longitudinal fiber glue rib 5, and the fiber bundle and the glue solution in the transverse joint seam 10 are coagulated into the transverse fiber glue rib 6; the oblique fiber glue column 4, the longitudinal fiber glue rib 5 and the transverse fiber glue rib 6 are bonded into a crisscross grid enclosure 7 which is criss-cross interwoven. Finally, the glass fiber fabrics 8 arranged on the upper top surface and the lower bottom surface of the sandwich panel 1 are glued with the sandwich panel 1, the vertical fiber glue columns 3 in the sandwich panel 1 and the groined fence 7 to form an integral sandwich material through glue dipping, so that the compression resistance of the sandwich material is remarkably enhanced, and the sandwich material can be used as a qualified sandwich material for the blade root area of the wind power blade shell instead of a light wood material.
It should be noted that, in the longitudinal fiber reinforcements 5 and the transverse fiber reinforcements 6 of the present invention, generally, during the glue dipping process, all the longitudinal fiber bundles 16 in one longitudinal slit 9 will be integrally bonded, and all the transverse fiber bundles 17 in one transverse slit 10 will be integrally bonded, so that the longitudinal fiber reinforcements 5 and the transverse fiber reinforcements 6 are not generally separately present in the sandwich panel, but are shown separately in the drawings for ease of understanding.
It is clear that the above-described embodiments are only intended to illustrate the invention more clearly and are not to be considered as limiting the scope of protection covered by the invention, any modification of equivalent forms being considered as falling within the scope of protection covered by the invention.
Claims (9)
1. A method for enhancing the compression resistance of a sandwich material is characterized in that a sandwich plate (1) is used as a supporting body, the inner and outer parts of the sandwich panel (1) are constructed with a compressive mechanics integral structure capable of bearing multidirectional pressure, namely, a fiber bundle is placed in the sandwich panel in an open way, after the impregnation process, a vertical fiber glue column (3), an oblique fiber glue column (4), a longitudinal fiber glue rib (5) and a transverse fiber glue rib (6) can be formed in the sandwich panel (1), and the oblique fiber glue column (4), the longitudinal fiber glue rib (5) and the transverse fiber glue rib (6) form a crisscross grid enclosure (7) which is longitudinally and transversely interwoven and integrally bonded in the sandwich board, meanwhile, glass fiber fabrics (8) pasted on the upper surface and the lower surface of the sandwich panel (1) before gum dipping are utilized to form an integral framework formed by bonding the glass fiber fabrics (8), the vertical fiber glue columns (3) and the groined fence (7).
2. The method for enhancing the compression resistance of sandwich material as claimed in claim 1, wherein the oblique fiber glue pillars (4), the longitudinal fiber glue ribs (5) and the transverse fiber glue ribs (6) form criss-cross grid-shaped barriers (7) which are integrally bonded in a criss-cross manner in the sandwich panel, two adjacent oblique fiber glue pillars (4) in the sandwich panel (1) are bonded to both sides of the longitudinal fiber glue ribs (5) in an X-shape, two adjacent oblique fiber glue pillars (4) in the sandwich panel (1) are bonded to both sides of the transverse fiber glue ribs (6) in an X-shape, and simultaneously, the adjacent longitudinal fiber glue ribs (5) and the transverse fiber glue ribs (6) are bonded to each other.
3. The method for enhancing the compression resistance of a sandwich material according to claim 2, wherein the placement path of each fiber bundle for making the mechanical structure is set as an independent placement path, and the placement path of the oblique fiber bundle is communicated with the placement path of the adjacent longitudinal fiber bundle or the placement path of the transverse fiber bundle.
4. A method for enhancing the compression resistance of a sandwich material according to claim 3, wherein the fiber bundles are laid on the sandwich sheet material (1) at equal intervals by forming a plurality of orthogonal longitudinal slits (9) and transverse slits (10) to divide the sandwich sheet material (1) into a plurality of sandwich blocks (2) connected at the bottom; vertical holes (11) are drilled downwards on the sandwich block (2), and inclined holes (12) are drilled downwards on the edge parts of 4 sides of the sandwich block along the front surface (21), the left side surface (22), the rear surface (23) and the right side surface (24) respectively.
5. The method for enhancing the compression resistance of a sandwich material according to claim 4, wherein the inclined holes (12) drilled down the front face (21), the left side face (22), the rear face (23) and the right side face (24) respectively are all provided with chordal notches (13) for passing glue.
6. The method for enhancing the compression resistance of a sandwich material according to claim 5, wherein the inclined directions of the inclined holes (12) on the front surface (21), the left side surface (22), the rear surface (23) and the right side surface (24) are identical in a clockwise direction, so that the inclined directions of the inclined holes (12) on two adjacent surfaces of two adjacent sandwich blocks (2) on the sandwich panel (1) are opposite, and the projections of the two inclined holes (12) are crossed in an X shape.
7. The method for enhancing the compression resistance of a sandwich material according to claim 4, wherein the inclined holes (12) and the vertical holes (11) are all holes which are through-going up and down the sandwich block (2).
8. A method for enhancing the compression resistance of a sandwich material according to any of claims 4 to 7, characterized in that it comprises the following steps:
1) cutting a longitudinal cutting seam (9) and a transverse cutting seam (10) on the sandwich panel (1) to divide the sandwich panel (1) into a plurality of sandwich blocks (2); drilling a vertical hole (11) and an oblique hole (12) on the sandwich square block;
2) placing fiber bundles in the longitudinal joint cuts (9), the transverse joint cuts (10), the vertical holes (11) and the oblique holes (12) in the step 1;
3) bonding permeable and easily-cut glass fiber fabrics on the upper surface and the lower surface of the sandwich plate (1), and restraining the fiber bundles placed in the step 2 in the sandwich plate (1);
4) when the sandwich panel (1) is required to be applied, gum dipping and curing are carried out on the sandwich panel (1) manufactured in the step (3); or directly dipping and curing the sandwich panel (1) manufactured in the step (3) for later use.
9. The method for enhancing the compression resistance of sandwich material according to claim 8, wherein the step 2) of placing the fiber bundles in the longitudinal slits (9) and the transverse slits (10) is performed in an alternating manner by placing one longitudinal fiber bundle and then one transverse fiber bundle, and the process is repeated.
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| EP1617993A4 (en) * | 2003-03-28 | 2009-09-30 | Webcore Technologies Inc | Fiber reinforced composite cores and panels |
| US8431214B2 (en) * | 2007-07-31 | 2013-04-30 | The Boeing Company | Composite structure having reinforced core and method of making same |
| CN107250228A (en) * | 2014-12-22 | 2017-10-13 | 巴斯夫欧洲公司 | The fiber enhanced foam material being made up of the fragment interconnected |
| CN110202856A (en) * | 2018-02-28 | 2019-09-06 | 空中客车防卫和太空有限责任公司 | Composite panel with reinforcement pins |
| CN110774624A (en) * | 2019-10-12 | 2020-02-11 | 浙江联洋新材料股份有限公司 | Method for processing stepped hole type Z-direction reinforced core material |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1617993A4 (en) * | 2003-03-28 | 2009-09-30 | Webcore Technologies Inc | Fiber reinforced composite cores and panels |
| US8431214B2 (en) * | 2007-07-31 | 2013-04-30 | The Boeing Company | Composite structure having reinforced core and method of making same |
| CN107250228A (en) * | 2014-12-22 | 2017-10-13 | 巴斯夫欧洲公司 | The fiber enhanced foam material being made up of the fragment interconnected |
| CN110202856A (en) * | 2018-02-28 | 2019-09-06 | 空中客车防卫和太空有限责任公司 | Composite panel with reinforcement pins |
| CN110774624A (en) * | 2019-10-12 | 2020-02-11 | 浙江联洋新材料股份有限公司 | Method for processing stepped hole type Z-direction reinforced core material |
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