CN110626471A - Combined keel and surfboard resisting bending and twisting composite deformation - Google Patents

Combined keel and surfboard resisting bending and twisting composite deformation Download PDF

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Publication number
CN110626471A
CN110626471A CN201911066994.6A CN201911066994A CN110626471A CN 110626471 A CN110626471 A CN 110626471A CN 201911066994 A CN201911066994 A CN 201911066994A CN 110626471 A CN110626471 A CN 110626471A
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China
Prior art keywords
keel
fiber
layer
main body
profile
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CN201911066994.6A
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Chinese (zh)
Inventor
张广基
张华根
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Individual
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Individual
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Priority to CN201911066994.6A priority Critical patent/CN110626471A/en
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    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/57—Boards characterised by the material, e.g. laminated materials
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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a combined keel and a surfboard with bending and torsion resistance composite deformation, wherein the combined keel comprises: the keel comprises a keel main body and at least one layer of fiber groove profile arranged on the top surface and/or the bottom surface of the keel main body. The U-shaped fiber groove profile is connected with the keel main body into a whole, so that the comprehensive strength of the keel for resisting bending and twisting composite deformation is greatly improved, the elasticity is good, the surfboard is not easy to break, and the safety of the surfboard is greatly improved.

Description

Combined keel and surfboard resisting bending and twisting composite deformation
Technical Field
The invention relates to the technical field of surfboards, in particular to a combined keel capable of resisting bending and twisting combined deformation and a surfboard with the combined keel.
Background
The surfboard is a leisure sports equipment for surfing, and a user can surf on the surfboard in a standing mode, so that the strength of the surfboard needs to be enhanced, and the surfboard is prevented from being broken. The surfboard can be divided into the following parts according to the existing production process: glass fiber surfboards and non-glass fiber surfboards.
The first type of fiberglass bodyboard is formed by bonding a layer of hard fiberglass resin to the bottom and face of a foam core, which is hard on the surface and is commonly referred to as a hardboard. Conventional foamed core web materials include expanded low density polystyrene (EPS) and expanded Polyurethane (PU). Some anti-bending materials can be further added into the foam core board to be used as keels so as to enhance the overall strength of the surfboard. The keel is usually clamped at the center of the foaming core plate by a wooden clamping plate, and the keel can also be made of reinforcing rods such as metal tubes, glass fiber tubes or carbon fiber tubes. The cross section of the reinforcing rod is generally a hollow round pipe or other special-shaped hollow pipe materials so as to reduce the weight of the reinforcing rod. The thickness of the wooden runner is typically around 5mm and the top and bottom of the plywood runner are bonded to the resin layers of the bottom and face of the bodyboard, and this wooden runner is of secondary importance to the overall strength of the bodyboard, which is provided primarily by the rigid outer shell of fiberglass cloth and resin bonded together.
In the second type of non-fiberglass surfboard, the fiberglass layer structure is not usually disposed on the surface of the foam core board, the plastic rubber board is disposed at the bottom of the foam core board, and the foam leather is disposed on the board surface of the foam core board. Because the surfboard does not have a glass fiber layer on the surface, the surfboard has great strength, and a keel structure is arranged in a foaming core board, so the keel is generally manufactured into a keel shape similar to an arc shape according to the shapes of the head portion tilting and the tail portion tilting of the surfboard.
The soft board generally does not use the fiber sheet or the fiber pipe as the keel, because the continuously extruded fiber sheet and the fiber pipe are only produced into linear sheets and pipes, the fiber sheet or the fiber pipe assembled in the foam core board can not extend to the tilting ends of the head and the tail of the surfboard, thus the two ends of the surfboard are easy to be broken, especially the longer soft board. Although the glass fiber product industry uses a mould mode to manufacture products with special shapes, the glass fiber product industry is not applied to the production of the keel of the surfboard because the glass fiber product industry needs manual manufacturing, the working procedure is complex, and the cost of the mould is high.
The keel of the soft board is usually cut and formed by hard wood such as a glued bamboo board, a plywood or a solid wood board, the keel made of the plywood or the hard wood board has a long history, and the cross section of the keel is generally vertical and larger than horizontal, so that the keel can generate larger vertical bending strength under the same weight. But it has problems that: when the surfboard is impacted by sea waves, the keel can be bent and deformed in the vertical direction and the horizontal direction at the same time, and if the impact force exceeds the breaking strength of the keel in the vertical direction or the horizontal direction, the surfboard is easy to break, so that the surfboard is harmful to users. The main reason for this problem is that the keel made of plywood, wood board or plywood bamboo board has a lower bending strength than the chemical fiber keel, for example, the width (horizontal direction) of the plywood bamboo board keel is increased to effectively improve the bending strength and avoid fracture, but this greatly increases the weight of the keel, which is not favorable for the application of the surfboard.
The soft board is originally designed for beginners, but the market at present has a certain demand for high-performance soft boards specially designed for experienced surfers, which are generally required to be lighter and have thinner foamed core boards than the traditional soft boards.
In addition, the problem that the wooden fossil fragments of adopting exist is: when the surfboard is used, water can penetrate into the foaming core board layer through the fish fin holes, so that the keel wood strip is broken due to water absorption and water decay, and a layer of waterproof material needs to be covered on the surface of the keel to prevent the keel material from absorbing water.
The invention provides an anti-breaking combined keel provided by Chinese patent CN105459466B, which comprises a wooden keel main body, wherein a rectangular section fiber sheet is attached to the top surface or the bottom surface of the keel main body, so that the bending strength of the keel in the horizontal direction is enhanced. The improved bending strength of the composite keel is due to the resistance of the fiber sheets to the bending deformation of the wooden keel.
However, when the surfboard is impacted by sea waves and the bending deformation of the keel is limited by the fiber sheet, the combined keel composed of the wooden keel and the fiber sheet has irregular torsional deformation. The cross-section of the keel of this patent is shown in figure 10. I.e. the keel 11 is forced to bend during a wave and a break situation still occurs. When the surfboard is operated by surf, the combined stress action of the weight of a user and the impact of the surf can be applied to the surf board, so that the keel generates torsion strain. Fig. 14 is a schematic view of a wooden keel bodyboard undergoing torsional deformation under torsional stress during surfing.
When a structural member, such as a wooden keel, is subjected to both bending and torsional stresses, the cross-sectional surface of the structural member is subjected to both torsional and bending deformation. If the structural member is left free to flex, the externally applied torsional stress will create a set of torsional shear stresses in the cross section of the keel, while the highest shear stresses will occur at the top surface of the cross section of the keel. The breaking point of the keel will occur at the top of the wooden keel and approximately in the center of the bodyboard. This mode of failure is known as torsional shear stress failure.
When the combined keel is deformed in the horizontal direction, a compressive stress is formed on the right side of the combined keel as shown in fig. 17, and the compressive stress causes the fiber sheet to bend and bounce at the right side part of the keel, and as a result, the fiber sheet is separated from the top of the keel after the fiber sheet is subjected to bending deformation because the shear stress intensity at the top of the keel is the largest.
Figures 19 and 20 are schematic views showing the separation of the buckling spring from the keel under compressive stress in the sheet of fibers. It is emphasized that when the sheet of fibers is separated from the keel, the bending deformation of the wooden keel is no longer limited by the sheet of fibers, and the wooden keel will break as the sheet of fibers delaminates.
Therefore, it is an urgent need in the art to overcome the problem of the conventional surfboard that is easily broken when subjected to bending and twisting combined deformation.
Disclosure of Invention
The invention provides a combined keel capable of effectively resisting bending and twisting composite deformation and a surfboard with the combined keel, aiming at solving the technical problem that the existing surfboard is easy to break under the action of bending and twisting composite deformation. The invention has high comprehensive strength of bending resistance and torsion resistance and good elasticity, so that the surfboard is not easy to break, and the safety of the surfboard is greatly improved.
The invention provides a combined keel capable of resisting bending and twisting composite deformation, which comprises a keel main body and at least one layer of fiber groove profile arranged on the top surface and/or the bottom surface of the keel main body. The fiber groove profile is characterized by being a U-shaped groove profile. The keel body has a top, bottom, left and right side surfaces, the top U-channel profile is made of fibrous material, having a right side flange plate and a left side flange plate, the right side flange plate being a vertically extending side plate of the top U-channel profile, the left side flange plate also being a vertically extending side plate of the top U-channel profile, the inner surface of the top U-channel profile being bonded to the top, left and right side surfaces of the keel body. The bottom U-channel profile is likewise made of fiber material, with a bottom U-channel profile right flange plate, which is the vertically extending side plate of the bottom U-channel profile, and a bottom U-channel profile left flange plate, which is also the vertically extending side plate of the bottom U-channel profile, the inner surface of the bottom U-channel profile being bonded to the bottom, left side and right side surfaces of the keel body. When the surfboard is manufactured, the combined keel is covered by the foaming core plate, and the foaming core plate is covered by the foaming leather.
Preferably, the fiber groove profile is multi-layered, and the fiber directions of the fiber groove profiles are different, that is, the fiber directions of the fiber groove profiles can be crossed.
Preferably, the outside two sides of the fiber channel profile layer are provided with fiber reinforced side panels.
Preferably, at least one end of the keel main body is tilted upwards, and the fiber groove profile extends to two ends of the keel main body and is attached to the surface of the keel main body. The length of the fiber groove profile is the same as or shorter than that of the keel main body.
Preferably, the keel body is made of wood, and the grain of the wood is parallel to the length direction of the fiber channel section. In another preferred embodiment, the keel body is made of a plywood bamboo plate formed by combining a plurality of long bamboo strips, the long bamboo strips are vertically arranged, the thickness surfaces of the long bamboo strips are mutually bonded in parallel, and the length direction of each long bamboo strip is approximately parallel to the axial direction of the surfboard.
Preferably, the width of the web of the fibre channel profile is greater than the thickness of the web.
Preferably, a first high-temperature-resistant waterproof glue layer is arranged between the fiber groove profile and the keel main body.
Preferably, the first layer of high temperature resistant waterproof glue layer is fixed in the fibre groove section bar in the fossil fragments main part and is constituted fossil fragments, and the whole surface of this fossil fragments covers there is the second layer of high temperature resistant waterproof glue layer.
Preferably, the width of the keel body ranges from 8mm ~ 18 mm.
Preferably, the inner width of the web of the fibre channel profile is substantially the same as the width of the keel body.
Preferably, the web thickness of the fibre channel profile is in the range of 1mm ~ 3 mm.
Preferably, the thickness of the flange plate of the fiber channel profile is in the range of 1mm ~ 4 mm.
Preferably, the height of the flange plate of the fibre channel profile is in the range of 3mm ~ 30 mm.
The invention also provides a surfboard with the combined keel with bending and torsion resistance composite deformation, which comprises a foaming core board layer, keels uniformly arranged in the foaming core board layer, at least one foaming surface base layer coated on the upper surface and the side surface of the foaming core board layer, at least one foaming subbase layer coated on the lower surface of the foaming core board layer, and a plastic solid board coated on the outer surface of the foaming subbase layer, wherein the keel is the combined keel with bending and torsion resistance composite deformation.
Wherein, the length of the anti-fracture combined keel is shorter than the foamed core plate layer.
Compared with the prior art, the invention has the following advantages:
1. the top surface and/or the bottom surface of the keel main body are/is made of fiber groove profiles, the fiber groove profiles are elastic due to the fact that the fiber groove profiles are thin, can extend to the arc-shaped parts at the two ends of the keel main body and can be tightly attached to the surface of the keel main body, the strength of the keel is enhanced, and meanwhile, the two fiber groove profiles are very slight for increasing the weight of the keel due to the fact that the fiber groove profiles are thin;
2. the tensile strength of the fiber groove profile is higher than that of the keel main body, so that when the keel main body and the fiber groove profile are connected into a whole, the fiber groove profile can effectively resist the deformation of the keel main body in the vertical direction;
3. the fiber groove profile is U-shaped in cross section, the width of the web plate is larger than the thickness of the web plate, the bonding area and the bonding strength between the fiber groove profile and the keel main body are increased due to the U-shaped cross section, and the fiber groove profile is not easy to separate from the keel main body due to the good engagement between the U-shaped fiber groove profile and the keel main body. In addition, the design of the flange plate of the fiber channel profile can increase the mechanical strength of the fiber channel profile, thereby greatly limiting the deformation of the combined keel in the transverse direction. After the keel main body and the fiber groove profile are connected into a whole, the fiber groove profile can also effectively resist the deformation of the keel main body in the horizontal direction, so that the fracture strength of the keel main body is greatly improved.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
figure 1 is a front elevational view of a preferred embodiment of the invention illustrating initial assembly of the keel;
figure 2 is a perspective view of the preferred embodiment of the present invention illustrating the preliminary assembly of the keel;
figure 3 is a front elevational view of the preferred embodiment of the present invention showing the keel assembled;
FIG. 4 is a schematic top view of FIG. 3;
figure 5 is a perspective view of the assembled keel of the preferred embodiment of the invention;
FIG. 6 is a schematic top view of the arrangement of the keel in the bodyboard in the preferred embodiment of the invention;
figure 7 is a cross-sectional view of the arrangement of the keels in the bodyboard in the preferred embodiment of the invention;
figure 8 is a longitudinal cross-sectional view of the arrangement of the keel in the bodyboard in the preferred embodiment of the invention;
figure 9 is a cross-sectional partial cross-sectional view of the arrangement of the keel within the bodyboard in the preferred embodiment of the invention;
figure 10 is a longitudinal cut away view of a prior keel assembled from fiberglass sheets and a wooden keel body;
figure 11 is a longitudinal cross-sectional view of the composite runner of the preferred embodiment of the present invention;
figure 12 is a longitudinal cross-sectional view of a prior art fiberglass stiffener wood keel, including keel dimensions and designations;
figure 13 is a longitudinal cross-sectional view of the U-channel section of the assembled keel of the preferred embodiment of the invention including the dimensions and designation of the U-channel section;
figure 14 is a schematic view of a section of a wood keel undergoing torsional deformation under torsional stress;
figure 15 is a perspective view of a wood keel undergoing torsional deformation under torsional stress;
figure 16 is a schematic view of a wooden keel broken under shear stress;
figure 17 is a perspective view of a prior art composite runner bent in a transverse direction;
figure 18 is a top plan view of a prior art composite runner with a transverse direction bending deformation;
figure 19 is a cross-sectional view of a prior art composite runner with the top fiberglass sheet separated from the body of the runner under transverse direction bending deformation;
figure 20 is a perspective view of a prior art composite keel showing the top fiberglass sheet projection separated from the main keel body under lateral bending deformation;
figure 21 is a perspective view of the preferred embodiment composite runner of the present invention shown in a transverse direction with a bending deformation;
figure 22 is a cross-sectional view of the preferred embodiment of the assembled keel of the invention in a stressed configuration between the U-channel profile and the keel body under bending deformation;
figure 23 is a top plan view of the preferred embodiment composite runner of the present invention shown in a transverse direction undergoing flexural deformation;
fig. 24 is a schematic top view of the composite keel bent and deformed in the transverse direction according to the preferred embodiment of the invention, showing the stress distribution of the U-shaped channel profile section;
figure 25 is a schematic perspective view of a U-channel profile glass fiber layer with two layer structures according to one embodiment of the present invention, showing a first fibre channel profile fiber layer and a second fibre channel profile fiber layer for use on the top of a keel body;
figure 26 is a schematic perspective view of a U-channel profile fiberglass layer having a multi-layer construction, showing a first layer of channel profile fiber layer, a second layer of channel profile fiber layer and a fiber reinforced channel profile cover on top of the keel body, according to another embodiment of the invention;
fig. 27 is a perspective view of a U-channel profile fiberglass layer with a multi-layered structure according to another embodiment of the invention, which is a first fiber channel profile fiber layer, a second fiber channel profile fiber layer, and fiber-reinforced side panels disposed on both outer sides of the fiber channel profile fiber layer.
Detailed Description
As shown in fig. 1 and 2, the composite keel capable of resisting bending and twisting complex deformation provided by the invention comprises a keel main body 11 and fiber groove profiles 12, wherein at least one layer of fiber groove profiles 12 is attached to one of the top surface or the bottom surface of the keel main body 11, and the fiber groove profiles 12 can be attached to both the top surface and the bottom surface of the keel main body 11. The main body 11 may be linear, with one end tilted upward, or both ends tilted upward.
The first embodiment is a preferred embodiment of the present invention, as shown in fig. 1 and 2, in this embodiment, one end of the keel main body 11 is tilted upward, both the top surface and the bottom surface of the keel main body 11 are provided with a layer of fiber groove profile 12, and the fiber groove profile 12 is attached to the curved surface of the keel main body 11. The keel body 11 can be made of high-strength materials such as solid wood boards, plywood boards, glued bamboo boards, metal pipes, plastic boards, honeycomb boards and the like, and is preferably made of glued bamboo boards and plywood. The fiber channel profile 12 may be made of glass fiber, carbon fiber or other chemical fiber.
As shown in fig. 11, 12 and 13, the fiber channel profile 12 may be U-shaped in cross-section with a web width 47 greater than a web thickness 45, and the inner width 47 of the web of the fiber channel profile is substantially the same as the width 59 of the main body of the runner.
As shown in fig. 3, 4 and 5, the length of the fiber groove profile 12 is the same as or shorter than the main body 11 of the keel, but the fiber groove profile 12 should cover half of the length of the main body 11 of the covering type keel at minimum. Because fibre groove section bar 12's tensile strength is higher than fossil fragments main part 11, after the cambered surface of bending of fossil fragments main part 11 was provided with fibre groove section bar 12, the shock resistance on fossil fragments two sides is more balanced even, and the elasticity of fossil fragments improves by a wide margin, and elastic fossil fragments can improve the control performance of surfboard. Meanwhile, as the section of the web plate of the fiber groove profile is rectangular, the width of the web plate is larger than the thickness of the web plate, the fiber groove profile 12 can effectively resist the deformation of the keel main body 11 in the horizontal direction, the bending strength of the combined keel in the horizontal direction is integrally improved, the keel is not easy to break, and the safety of the surfboard is ensured. Keel main body 11 and fibre groove section bar 12 fixed connection are as an organic whole to guarantee that both can not take place mutual slip when bearing the exogenic action, its connected mode can be mechanical system such as glue bonding, screw, blind rivet or cord area, and preferred connected mode is glue bonding, passes through high temperature resistant waterproof glue bonding between fibre groove section bar 12 and the keel main body 11, forms the waterproof glue layer of first layer high temperature resistant. The specific manufacturing method comprises the following steps: high temperature resistant waterproof glue that is minimum 60 ℃ in fossil fragments main part 11's top surface and bottom surface difference upper melting point, paste this top surface and bottom surface with fibre groove profile 12 branch, then as shown in fig. 3, 4, 5 interval winding several sections on combination fossil fragments have been kept in or the glue machine 35, make fibre groove profile 12 can fix temporarily on fossil fragments main part 11.
In order to further enhance the connection and waterproof performance between the keel and the foam core board, after the fiber groove profile 12 is fixed on the keel main body 11 by the high-temperature-resistant waterproof glue layer, the whole surface of the keel main body 11 is coated with the high-temperature-resistant waterproof glue layer to form a second high-temperature-resistant waterproof glue layer 55 (as shown in fig. 11), and the glue layer bonds the combined keel and the foam core board layer into a whole, so that the structure of the surfboard is firmer, and the glue layer also has the function of preventing the keel from absorbing water.
As shown in fig. 11, 12 and 13, the composite keel of the invention comprises: the keel body 11, which has a keel top surface 33, a keel bottom surface 34, a keel left surface 32 and a keel right surface 31, is shown in figure 11 with a top U-shaped channel profile 13 bonded to the keel body 11 top surface 33 by a layer of glue 56 and a bottom U-shaped channel profile 14 bonded to the keel body 11 bottom surface 34 by a layer of glue 57. The main body 11, the top U-shaped fiber channel section 13 and the bottom U-shaped fiber channel section 14 are combined to form the combined keel of the invention. The keel body may be made of wood having grain substantially parallel to the length of the U-shaped top channel section and the U-shaped bottom channel section. In another preferred embodiment, the keel body is made of a plywood bamboo plate formed by combining a plurality of long bamboo strips, the long bamboo strips are vertically arranged, the thickness surfaces of the long bamboo strips are mutually bonded in parallel, and the length direction of each long bamboo strip is approximately parallel to the axial direction of the surfboard. The bamboo chips of the glued bamboo boards may be relatively thin long chips and arranged vertically, so that the glued bamboo boards may be made of multi-layer bamboo chips, for example the thickness of the bamboo boards may be made by gluing and pressing two or more layers of bamboo chips.
As shown in fig. 11, 12 and 13, the composite runner of the present invention comprises: a keel main body 11 and a U-shaped fiber groove profile 12 arranged on the top surface and/or the bottom surface of the keel main body. The keel body 11 is characterized by comprising a top surface 33, a bottom surface 34, a left surface 32 and a right surface 31, the U-shaped fiber groove profile 12 comprises a web section and two flange plate sections, and the U-shaped fiber groove profile comprises a web inner surface 43, a web outer surface 49, a right flange plate surface 41 and a left flange plate surface 42. The top U-shaped channel profile 13 is made of a fibrous material, with a right-hand flange plate and a left-hand flange plate, the right flange plate is a vertically extending section of the top U-shaped channel section, the left flange plate is also a vertically extending section of the top U-shaped channel section, the inner surfaces 41, 42, 43 of the top U-channel profile are glued to the top surface 33, the left surface 32 and the right surface 31 of the keel body, the bottom U-channel profile is likewise made of a fibrous material, with a bottom U-channel profile right edge plate and a bottom U-channel profile left edge plate, the right flange plate is a vertically extending section of the bottom U-shaped groove profile, the left flange plate is also a vertically extending section of the bottom U-shaped groove profile, the inner surface of the bottom U-channel profile is glued to the bottom surface 34, the left side surface 32 and the right side surface 31 of the keel body. The combined keel has the important advantage that the fiber groove profile and the keel body are well combined.
In the specific manufacturing process, the height 58 and the width 59 of the keel body 11 are generally in the range of 5mm-30mm, and the optimal width is in the range of 8mm-18 mm. The width 44 range of the fiber groove profile 12 is generally 6mm-42mm, the optimal width range is 9mm-30mm, the thickness range of the web plate thickness 45 of the fiber groove profile is generally 0.5mm-5mm, the optimal thickness range is 1mm-3mm, the thickness range of the flange plate thickness 46 of the fiber groove profile is generally 0.5mm-6mm, the optimal thickness range is 1mm-4mm, the height range of the flange plate height 48 of the fiber groove profile is generally 3mm-30mm, the fiber groove profile 12 is thin, elastic and light in weight, can be tightly attached to the arc shape at the two ends of the keel main body 11, and can reduce the influence on the overall weight of the keel.
The second embodiment of the invention is to stick the fiber groove profile 12 on the top surface of the keel body 11, the third embodiment is to stick the fiber groove profile 12 on the bottom surface of the keel body 11, the second and third embodiments can also improve the elasticity and bending strength of the keel to a certain extent, and the sticking positions and the number of the fiber groove profiles on the keel body 11 can be selected according to the needs in practical use.
As previously described, the inner surface of the web of the U-channel section is bonded to the top/bottom surface of the main body of the keel, the right flange of the U-channel section is bonded to the right surface of the main body of the keel, and the left flange of the U-channel section is bonded to the left surface of the main body of the keel, when the composite keel is subjected to a significant impact force, deformation of the composite keel is limited without free bending, as shown in FIG. 21 ~ FIG. 23, the compressive and tensile stresses created by the two flanges of the channel section when the composite keel is deformed in a lateral direction, as shown in FIG. 22, the compressive stress on the right side of the channel section may have the undesirable effect of buckling separation of the fiber sheet, but the upward tensile stress on the right side of the channel section is resisted by the adhesive bond between the right flange and the right surface of the main body of the keel, the shear strength of the adhesive layer is higher than the tensile strength of the channel section, which effectively resists separation of the channel section, and the additional resistance to transverse deformation of the channel section is greater than the thickness of the composite keel, thus providing a reasonable combination keel design.
As shown in fig. 6, 7, 8 and 9, the present invention also proposes a bodyboard 2 having the combined keel of the invention, comprising: the composite keel structure comprises a foaming core plate layer 21, the composite keels 1 uniformly arranged in the foaming core plate layer 21, at least one foaming surface base layer 22 coated on the upper surface and the side surface of the foaming core plate layer 21, at least one foaming underlayer coated on the lower surface of the foaming core plate layer 21, and a plastic solid plate 23 coated on the outer surface of the foaming underlayer. The foam underlayment can be arranged into a plurality of layers, and the density of the foam underlayment is gradually increased from the innermost layer to the outer layer so as to increase the structural strength of the bottom of the surfboard. As shown in fig. 8 and 9, in the preferred embodiment, the foam base layer is provided with two layers, an inner foam base layer 24 covering the lower surface of the foam core layer 21 and an outer foam base layer 25 covering the lower surface of the inner foam base layer 24.
Wherein the foamed core layer has a thickness in the range of 13mm to 150mm (preferably 25mm to 90 mm) and a density in the range of 15kg/m3-65kg/m3(preferably 18 kg/m)3-40kg/m3) The material can be Expanded Polystyrene (EPS), expanded polypropylene (EPP), Expanded Polyethylene (EPE), Expanded Polyolefin (EPO) or expanded polyurethane (PU foam), and preferably Expanded Polystyrene (EPS). The thickness of the foaming surface base layer is in the range of 1mm-6mm (preferably 3mm-5 mm) and the density is in the range of 45 kg%m3-176kg/m3(preferably 56 kg/m)3-128kg/ m3) The material can be selected from foamed Polyethylene (PE), foamed polypropylene (PP) or foamed Ethylene Vinyl Acetate (EVA), and preferably foamed Polyethylene (PE). The foamed sub-layer has a thickness in the range of 1mm to 6mm (preferably 2mm to 4 mm) and a density in the range of 27 kg/m3-128kg/ m3(preferably 38-104 kg/m)3) The material can be selected from foamed Polyethylene (PE), foamed polypropylene (PP) or foamed Ethylene Vinyl Acetate (EVA), and preferably foamed Polyethylene (PE). The plastic solid plate has a thickness in the range of 0.1mm-2mm (preferably 0.35mm-1.2 mm) and is made of polyethylene or polypropylene.
As shown in fig. 6 and 7, the length of the anti-fracture combination keel 1 is shorter than that of the foam core board layer 21, one to five keels 1 are arranged in the general surfboard 2, the length of the keel at the middle position is usually longer than that of the keels at the two sides, and the keels at the two sides are symmetrically arranged. However, if desired, for example, to avoid the position of the fish fin, the keel may be oriented at an angle to the centerline of the bodyboard and tilted so that the keel extends to the tail of the bodyboard.
The soft board keel thus dominates the stiffness of the bodyboard in addition to bearing the weight of the surfer, and it has just been explained that the keel width of the soft board cannot be too narrow because the keel is subject to breaking when impacted by sea waves. When the U-shaped fiber groove profile is used for reinforcing the wooden keel, the wooden keel with the narrower width of the keel can be adopted to achieve the effect of reducing the weight, and meanwhile, the combined keel is not easy to break in the wave sliding process. In summary, the combined keel designed by the invention obviously improves the anti-fracture function of the traditional soft board.
As shown in fig. 25 and 26, the trough-shaped fiber material 12 may be formed by two or more layers of fiberglass, and the top first layer of trough-shaped fiber material 62 may have a different fiber orientation than the second layer of trough-shaped fiber material 63. In a similar way, the fiber yarn direction of the first fiber groove profile layer at the bottom can be arranged to be different from the fiber yarn direction of the second fiber groove profile layer.
As shown in fig. 25, the cross-sectional structure of the U-shaped fiber channel profile of one of the embodiments of the present invention. The structure comprises a multi-layer fiber structure with two glass fiber layers. The top first layer of U-shaped fibre channel profile 62 overlaps the second layer of U-shaped fibre channel profile 63, the filaments of the first layer of U-shaped fibre channel profile 62 having a first filament direction 67 and the filaments of the second layer of U-shaped fibre channel profile 63 having a second filament direction 68. Preferably, the angle 69 formed by the first fiber filament direction 67 and the second fiber filament direction 68 is greater than 30 °, and the multi-layer fiber layer forming structure is beneficial to the U-shaped channel profile to strengthen the torsional strength of the combined keel.
As shown in fig. 26, a cross-sectional structure of a U-shaped fiber channel profile of another embodiment. The structure is characterized in that another glass fiber reinforced groove profile upper cover 64 is added outside the multilayer fiber groove profile layer 60. Better, glass fiber material uses glass fiber monofilament structure, and the extending direction of glass fiber is parallel with the axis of ordinates length direction of U-shaped fibre groove section bar, therefore has strengthened the bending strength of combination fossil fragments in the vertical direction.
As shown in fig. 27, a cross-sectional structure of a U-shaped fiber channel profile of yet another embodiment. The U-shaped fiber groove profile is characterized in that a pair of reinforcing side plates are attached to the side faces of two flange plates of the outermost U-shaped fiber groove profile.
For example, the top multi-layer U-shaped fiber channel profile 60 is provided with a first reinforcing side piece 65 and a second reinforcing side piece 66 on both flange plate sides. The first reinforcing side piece 65 extends vertically and is attached to the left side of the flange plate of the U-shaped fibre channel profile 60, and the second reinforcing side piece 66 extends vertically and is attached to the right side of the flange plate of the U-shaped fibre channel profile 60. The reinforcing side piece can be a fiber sheet made of glass fiber, carbon fiber or other artificial fiber materials, preferably, the fiber sheet is made of glass fiber monofilament fiber, and the extending direction of the fiber filament on the reinforcing side piece is consistent with the longitudinal axis direction of the U-shaped groove profile, so that the bending strength of the combined keel in the horizontal direction is enhanced.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. that are made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The combined keel capable of resisting bending and twisting composite deformation comprises a keel main body (11), and is characterized in that at least one layer of fiber groove profile (12) is arranged on the top surface and/or the bottom surface of the keel main body (11).
2. A composite runner according to claim 1, characterised in that the fibre channel profile (12) is multi-layered, the fibre direction of the fibre channel profiles (12) being different in each layer.
3. A composite runner according to claim 1, characterised in that the fibre channel profile (12) is provided with fibre-reinforced side pieces on both outer sides.
4. The combined keel according to claim 1, wherein at least one end of the keel main body (11) is tilted upwards, the fiber groove profile (12) extends to two ends of the keel main body (11) and is attached to the surface of the keel main body (11); the length of the fiber groove profile (12) is the same as that of the keel main body (11) or shorter than that of the keel main body (11).
5. A composite runner according to claim 1, characterised in that the fibre channel profile (12) has a web width greater than a web thickness.
6. The assembled keel according to claim 1, characterized in that a first layer of high temperature resistant waterproof glue layer is arranged between the fibre channel profile (12) and the keel body (11).
7. The assembled keel according to claim 6, wherein the first layer of high temperature resistant waterproof glue layer fixes the fiber channel section to the keel body to form the keel, and the whole surface of the keel is covered with the second layer of high temperature resistant waterproof glue layer.
8. A composite runner as set forth in claim 1, characterized in that said runner body (11) has a width in the range of 8mm ~ 18 mm.
9. A composite runner according to claim 1, characterised in that the web thickness (45) of the fibre channel profile (12) is in the range of 1mm ~ 3 mm.
10. A bodyboard having a built-up runner as claimed in any one of claims 1 to 9.
CN201911066994.6A 2019-11-04 2019-11-04 Combined keel and surfboard resisting bending and twisting composite deformation Pending CN110626471A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI305763B (en) * 2006-01-26 2009-02-01 Tzong In Yeh Sports board with stringer
CN201614748U (en) * 2009-11-02 2010-10-27 白铁军 Composite-material brace keel
WO2014017924A1 (en) * 2012-07-23 2014-01-30 Paul Barron Improved floatation device
CN105459466A (en) * 2015-12-31 2016-04-06 张广基 Anti-cracking combined keel and surfboard
CN207812831U (en) * 2018-01-29 2018-09-04 河南天丰钢结构有限公司 A kind of steel structure column beam compound section structure
CN208088505U (en) * 2018-03-22 2018-11-13 湖南新鼎钢结构制造有限公司 A kind of novel building steel structure node
CN110241972A (en) * 2019-05-14 2019-09-17 东北林业大学 A kind of novel fabricated laminated wood-light gauge cold-formed steel shape combination beam and production method
CN211391610U (en) * 2019-11-04 2020-09-01 张广基 Combined keel and surfboard resisting bending and twisting composite deformation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI305763B (en) * 2006-01-26 2009-02-01 Tzong In Yeh Sports board with stringer
CN201614748U (en) * 2009-11-02 2010-10-27 白铁军 Composite-material brace keel
WO2014017924A1 (en) * 2012-07-23 2014-01-30 Paul Barron Improved floatation device
CN105459466A (en) * 2015-12-31 2016-04-06 张广基 Anti-cracking combined keel and surfboard
CN207812831U (en) * 2018-01-29 2018-09-04 河南天丰钢结构有限公司 A kind of steel structure column beam compound section structure
CN208088505U (en) * 2018-03-22 2018-11-13 湖南新鼎钢结构制造有限公司 A kind of novel building steel structure node
CN110241972A (en) * 2019-05-14 2019-09-17 东北林业大学 A kind of novel fabricated laminated wood-light gauge cold-formed steel shape combination beam and production method
CN211391610U (en) * 2019-11-04 2020-09-01 张广基 Combined keel and surfboard resisting bending and twisting composite deformation

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