Large-size rotary cylinder and preparation method thereof

Abstract

The invention discloses a large-size rotary cylinder and a preparation method thereof, the large-size rotary cylinder comprises an outer wall and an inner wall of a wing-shaped section cylindrical structure, two groups of corresponding ends of the outer wall and the inner wall are connected, the outer wall is provided with a fixed base joint, and the inner wall is provided with a flow guide support arm joint; a part of the area, corresponding to the joint of the fixed base, on the outer wall is a solid composite material wall, and part or all of the rest areas are of a sandwich structure formed by wrapping a foam core material with a composite material skin; a part of the inner wall corresponding to the joint of the flow guide support arms is a solid composite material wall, and part or all of the rest areas are of a sandwich structure formed by wrapping a foam core material with a composite material skin. The device is applied to the technical field of composite material barrel forming, so that the barrel has high structural strength and axial deformation resistance, other auxiliary supporting devices are not needed except that the bottom of the barrel needs to be supported by a fixed base, the occupied space is greatly saved, and the assembly difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of composite material cylinder molding, in particular to a large-size airfoil cross-section rotating cylinder and a preparation method thereof. Background Art

[0002] The duct assembly of a hovercraft typically consists of a fixed base, a cylinder, diversion arms, and a diversion shroud. The cylinder, with an airfoil-shaped cross-section, is mounted on the fixed base, while the diversion shroud is positioned within the cylinder via the diversion arms. In previous duct assemblies, in addition to the fixed base supporting the bottom of the cylinder, other supporting structures were typically included to prevent axial movement or deformation during operation. However, the addition of these supporting structures not only occupies a large space but also complicates the assembly process and is costly. Therefore, a large-scale rotating cylinder with sufficient strength that can be supported solely by a fixed base is urgently needed. Summary of the Invention

[0003] In response to the above-mentioned deficiencies in the prior art, the present invention provides a large-sized rotating cylinder and a preparation method thereof, which has high structural strength and resistance to axial deformation. Except for the fixed base support at the bottom, it does not require other auxiliary support devices, which greatly saves floor space and reduces assembly difficulty.

[0004] To achieve the above-mentioned object, the present invention provides a large-sized rotating cylinder, comprising an outer wall and an inner wall of an airfoil-shaped cylindrical structure, wherein two sets of corresponding ends of the outer wall and the inner wall are connected, the outer wall has a fixed base connection, and the inner wall has a guide arm connection; The portion of the outer wall corresponding to the connection with the fixed base is a solid composite material wall, and part or all of the remaining other regions are a sandwich structure of a composite material skin covering a foam core; A portion of the inner wall corresponding to the connection of the guide arm is a solid composite material wall, and part or all of the remaining other regions are a sandwich structure with a composite material skin covering a foam core.

[0005] In one embodiment, the outer wall includes a first composite material skin on the surface and a first foam core on the inner layer. A first hollow is provided on the first foam core at a position corresponding to the connection with the fixed base, and the first hollow is filled with a first composite material reinforcement layer. The inner walls include a second composite material skin on the surface and a second foam core on the inner layer. A second hollow is provided on the second foam core at a position corresponding to the connection of the guide arm, and the second hollow is filled with a second composite material reinforcement layer.

[0006] In one embodiment, the second hollowing cuts off the second foam core material, that is, the second composite material reinforcement layer covers the entire longitudinal direction of the inner wall.

[0007] In one embodiment, a plurality of circumferential ribs and a plurality of longitudinal ribs are provided between the inner wall and the outer wall; One end of the annular rib and the longitudinal rib is connected to the inner surface of the outer wall, and the other end of the annular rib and the longitudinal rib is connected to the inner surface of the inner wall.

[0008] In one embodiment, the portion of the outer wall corresponding to the longitudinal ribs is a solid composite material wall; and / or A portion of the inner wall corresponding to the longitudinal ribs is a solid composite material wall.

[0009] In one embodiment, the portion of the outer wall corresponding to the annular rib is a solid composite material wall; and / or A portion of the inner wall corresponding to the annular rib is a solid composite material wall.

[0010] To achieve the above object, the present invention further provides a method for preparing the above-mentioned large-sized rotary cylinder, comprising the following steps: The outer wall and the inner wall are respectively subjected to petal molding to obtain a plurality of petal inner walls and petal outer walls, including: First, lay the outer composite reinforcement layer / prepreg on the outer surface of the petal inner wall and the petal outer wall; Lay the foam core material on the outer composite reinforcement layer / prepreg and reserve a hollow area corresponding to the solid composite wall, and then lay the middle composite reinforcement layer / prepreg of the solid composite wall in the hollow area; or first lay the middle composite reinforcement layer / prepreg of the solid composite wall on the outer composite reinforcement layer / prepreg, and then lay the foam core material; After laying the inner composite material reinforcement layer / prepreg on the upper surface of the foam core material and the middle composite material reinforcement layer / prepreg, the inner and outer petal walls are cured and formed using a vacuum bag pressing process; Finally, the petal inner wall and the petal outer wall are assembled according to the preset positions to complete the preparation of the large-size rotating cylinder.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention achieves this by configuring portions of the outer and inner walls corresponding to the fixed base connections and the guide arm connections as solid composite material walls, while maintaining a composite material skin / foam sandwich structure for a large area of ​​the outer and inner wall main structures. This greatly enhances the rigidity and strength of the cylinder while minimizing weight, so that the cylinder does not require any other auxiliary support devices except for the fixed base support at the bottom, thereby greatly saving space and reducing assembly difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0013] Figure 1 Schematic diagram of the structure of the catheter device in an embodiment of the present invention; Figure 2 A partial cross-sectional view of the outer wall in an embodiment of the present invention; Figure 3 It is a partial cross-sectional view of the inner wall in an embodiment of the present invention.

[0014] Figure numbers: cylinder 1, outer wall 101, first composite skin 1011, first foam core material 1012, first composite reinforcement layer 1013, inner wall 102, second composite skin 1021, second foam core material 1022, second composite reinforcement layer 1023, fixed base 2, guide arm 3, guide cover 4.

[0015] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0018] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0019] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or adhesive connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0020] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0021] Example 1 This embodiment discloses a large-sized rotating cylinder (hereinafter referred to as "cylinder"), which is mainly used as the cylinder of the duct device on the hovercraft. Figure 1 The duct device consists of a cylinder 1, a fixed base 2, a flow guide arm 3, and a flow guide cover 4. The cylinder 1 is mounted on the fixed base 2, and the flow guide cover 4 is mounted within the cylinder 1 via the flow guide arm 3. The cylinder 1 includes an outer wall 101 and an inner wall 102 of a cylindrical structure with an airfoil cross-section. The outer wall 101 and the inner wall 102 are connected at two corresponding ends. Therefore, the outer wall 101 has a fixed base connection for connecting to the fixed base 2, and the inner wall 102 has a flow guide arm connection for connecting to each flow guide arm 3.

[0022] In this embodiment, the portion of the outer wall 101 corresponding to the connection with the fixed base is a solid composite wall, and the remaining portion or all of the other regions are a sandwich structure of a composite skin covering a foam core; the portion of the inner wall 102 corresponding to the connection with the guide arm is a solid composite wall, and the remaining portion or all of the other regions are a sandwich structure of a composite skin covering a foam core. That is, the portions of the outer wall 101 and inner wall 102 corresponding to the connection with the fixed base and the guide arm on the cylinder 1 are set as solid composite walls, while the outer wall 101 and inner wall 102 main structure are largely made of the composite skin / foam sandwich structure. This greatly enhances the rigidity and strength of the cylinder 1 while minimizing weight. This means that the cylinder 1 does not require any other auxiliary support devices other than the fixed base 2 at the bottom, greatly saving space and reducing assembly difficulty.

[0023] refer to Figure 2 、 Figure 3The outer wall 101 comprises a first composite skin 1011 on the surface and a first foam core 1012 on the inner layer. The inner wall 102 comprises a second composite skin 1021 on the surface and a second foam core 1022 on the inner layer. A first hollow is defined on the first foam core 1012 at the location corresponding to the connection to the fixed base, and the first hollow is filled with a first composite reinforcement layer 1013. A second hollow is defined on the second foam core 1022 at the location corresponding to the connection to the guide arm, and the second hollow is filled with a second composite reinforcement layer 1023.

[0024] Taking into account that the guide arm 3 is flat and connected to the inner wall 102 along the longitudinal direction of the cylinder 1, this embodiment preferably makes the second hollow cut off the second foam core material 1022, so that the second composite material reinforcement layer 1023 covers the entire longitudinal direction of the inner wall 102, further enhancing the rigidity and strength of the cylinder 1.

[0025] In a specific implementation, a plurality of circumferential ribs and a plurality of longitudinal ribs are further provided between the inner wall 102 and the outer wall 101. One end of the circumferential ribs and the longitudinal ribs are connected to the inner wall 102 surface of the outer wall 101, and the other end of the circumferential ribs and the longitudinal ribs are connected to the inner wall 102 surface of the inner wall 102. Specifically, the longitudinal ribs are evenly spaced along the circumference of the cylinder 1 between the outer wall 101 and the inner wall 102. A plurality of arc-shaped circumferential ribs are installed and arranged along the axial direction of the cylinder 1 between two adjacent longitudinal ribs. All the circumferential ribs form a multi-layered ring beam between the outer wall 101 and the inner wall 102.

[0026] In a specific application, if the weight constraint of the cylinder 1 is low, the portion of the outer wall 101 corresponding to the longitudinal ribs can be made of a solid composite material wall, and / or the portion of the inner wall 102 corresponding to the longitudinal ribs can be made of a solid composite material wall. Alternatively, the portion of the outer wall 101 corresponding to the circumferential ribs can be made of a solid composite material wall, and / or the portion of the inner wall 102 corresponding to the circumferential ribs can be made of a solid composite material wall.

[0027] Example 2 This embodiment discloses a method for preparing a large-sized rotary cylinder, which mainly includes the following steps: The outer wall and the inner wall are separately subjected to petal molding to obtain a plurality of petal outer walls and petal inner walls, including: First, lay the outer composite reinforcement layer / prepreg on the outer surface of the petal outer wall and the petal inner wall; Lay the foam core material on the outer composite reinforcement layer / prepreg and reserve a hollow area corresponding to the solid composite wall, and then lay the middle composite reinforcement layer / prepreg of the solid composite wall in the hollow area; or first lay the middle composite reinforcement layer / prepreg of the solid composite wall on the outer composite reinforcement layer / prepreg, and then lay the foam core material; After laying the inner composite material reinforcement layer / prepreg on the upper surface of the foam core material and the middle composite material reinforcement layer / prepreg, the petal outer wall and the petal inner wall are cured and formed by using a vacuum bag pressing process; Finally, the petal inner wall and the petal outer wall are assembled according to the preset positions to complete the preparation of the large-size rotating cylinder.

[0028] In a specific implementation, if the cylinder includes annular ribs and longitudinal ribs, the final assembly process of the petal inner wall and the petal outer wall is preferably: First, the annular ribs and longitudinal ribs are fixedly mounted on the inner surface of the inner wall of each petal according to the preset position; Then, the inner walls of the petals are fixedly connected according to the preset positions to form an annular integral inner wall with annular ribs and longitudinal ribs; Finally, the outer walls of each petal are connected to the inner wall of the annular whole in sequence according to the preset positions to complete the assembly of the large-size rotating cylinder.

[0029] In the specific process of forming each petal inner wall, skirts extending toward the inner surface of the petal inner wall are formed on the left and right sides of each petal inner wall. Therefore, when fixing and connecting each petal inner wall according to the preset position, first place each petal inner wall with annular ribs and longitudinal ribs according to the preset position so that the two skirts on the adjacent sides of the two adjacent petal inner walls overlap, and then use bolts to connect and fix the two skirts on the adjacent sides. In this process, not only is it unnecessary to form a trough structure on the petal inner wall, the forming process of the petal inner wall is made more convenient. Moreover, when the two skirts on the adjacent sides are fixed with bolts, both skirts face outward and are not blocked by the outer wall, which makes construction operations more convenient. It does not affect the overall strength of the large-sized rotating cylinder, but also improves construction efficiency and reduces construction costs.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A large-sized rotary drum, characterized in that: The outer wall and the inner wall of the cylindrical structure including an airfoil cross section are connected to two sets of corresponding ends of the outer wall and the inner wall, the outer wall has a fixed base connection, and the inner wall has a guide arm connection; The portion of the outer wall corresponding to the connection with the fixed base is a solid composite material wall, and part or all of the remaining other regions are a sandwich structure of a composite material skin covering a foam core; A portion of the inner wall corresponding to the connection of the guide arm is a solid composite material wall, and part or all of the remaining other regions are a sandwich structure with a composite material skin covering a foam core.

2. The large-size rotary drum according to claim 1, characterized in that: The outer wall comprises a first composite material skin on the surface and a first foam core on the inner layer. A first hollow is provided on the first foam core at a position corresponding to the connection with the fixed base, and the first hollow is filled with a first composite material reinforcement layer. The inner walls include a second composite material skin on the surface and a second foam core on the inner layer. A second hollow is provided on the second foam core at a position corresponding to the connection of the guide arm, and the second hollow is filled with a second composite material reinforcement layer.

3. The large-sized rotary drum according to claim 2, characterized in that: The second hollowing cuts off the second foam core material, that is, the second composite material reinforcement layer covers the entire longitudinal direction of the inner wall.

4. The large-sized rotary drum according to claim 2 or 3, characterized in that: a plurality of circumferential ribs and a plurality of longitudinal ribs between the inner wall and the outer wall; One end of the annular rib and the longitudinal rib is connected to the inner surface of the outer wall, and the other end of the annular rib and the longitudinal rib is connected to the inner surface of the inner wall.

5. The large-sized rotary drum according to claim 4, characterized in that: The partial area of ​​the outer wall corresponding to the longitudinal rib is a solid composite material wall; and / or the partial area of ​​the inner wall corresponding to the longitudinal rib is a solid composite material wall.

6. The large-sized rotary drum according to claim 4, characterized in that: The partial area of ​​the outer wall corresponding to the annular rib is a solid composite material wall; and / or the partial area of ​​the inner wall corresponding to the annular rib is a solid composite material wall.

7. A method for preparing the large-sized rotary drum according to any one of claims 1 to 6, characterized in that: The steps include: The outer wall and the inner wall are respectively subjected to petal molding to obtain a plurality of petal inner walls and petal outer walls, including: First, lay the outer composite reinforcement layer / prepreg on the outer surface of the petal inner wall and the petal outer wall; Lay the foam core material on the outer composite reinforcement layer / prepreg and reserve a hollow area corresponding to the solid composite wall, and then lay the middle composite reinforcement layer / prepreg of the solid composite wall in the hollow area; or first lay the middle composite reinforcement layer / prepreg of the solid composite wall on the outer composite reinforcement layer / prepreg, and then lay the foam core material; After laying the inner composite material reinforcement layer / prepreg on the upper surface of the foam core material and the middle composite material reinforcement layer / prepreg, the inner and outer petal walls are cured and formed using a vacuum bag pressing process; Finally, the petal inner wall and the petal outer wall are assembled according to the preset positions to complete the preparation of the large-size rotating cylinder.

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