Method for assembling a large-sized rotary drum

Abstract

The application discloses an assembling method of a large-size rotary cylinder, the cylinder is a wing-shaped cross-section rotary cylinder, the cylinder comprises an inner wall, an outer wall, and annular ribs and longitudinal ribs arranged between the inner wall and the outer wall, and the assembling method comprises the following steps: separately forming the annular ribs and the longitudinal ribs, separately forming the inner wall and the outer wall in the form of segments, and obtaining a plurality of segmented inner walls and segmented outer walls; fixing and mounting each annular rib and each longitudinal rib on the inner surface of each segmented inner wall according to a preset position; fixedly connecting each segmented inner wall according to the preset position, and forming an annular integral inner wall with the annular ribs and the longitudinal ribs; and sequentially connecting each segmented outer wall on the annular integral inner wall according to the preset position, and completing the assembly of the fairing cylinder. The application relates to the technical field of air cushion vehicles, and can improve construction efficiency and reduce construction cost without affecting the overall strength.

Description

Technical Field

[0001] This invention relates to the field of hovercraft technology, specifically a method for assembling a large-size rotating cylinder. Background Technology

[0002] The ducting system of a hovercraft typically consists of a fixed base, an airfoil-shaped cylindrical body, guide arms, and a fairing. The airfoil-shaped cylindrical body is mounted on the fixed base, while the fairing is housed within the cylindrical body via the guide arms. Because the ducting system is a large component, the cylindrical body cannot be formed as a single, integral unit. Instead, the inner and outer walls of the airfoil-shaped cylindrical body and the reinforcing ribs are typically formed separately and then assembled. Current processes involve first preparing the cylindrical body into several segmented structures. For example, if there are five guide arms, the inner and outer walls of the cylindrical body are divided into 10 segments, each of which is formed individually. During assembly, the corresponding outer and inner walls of each segment are usually connected first to form the cylindrical body segments, and then all segments are connected. This requires creating a series of grooves on the inner and outer walls of each segment for mounting bolts, which not only affects the forming of the inner and outer walls of the cylindrical body and the overall strength but also makes assembly difficult and inefficient. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a method for assembling a large-size rotary cylinder, which can improve construction efficiency and reduce construction costs without affecting the overall strength.

[0004] To achieve the above objectives, the present invention provides a method for assembling a large-size rotary cylinder, wherein the large-size rotary cylinder is an airfoil section rotary body, including an inner wall, an outer wall, and circumferential and longitudinal ribs disposed between the inner wall and the outer wall. The assembly method includes the following steps:

[0005] Step 1: The circumferential ribs and the longitudinal ribs are individually formed, and the inner wall and the outer wall are segmented and formed to obtain several segmented inner walls and segmented outer walls.

[0006] Step 2: Fix each of the circumferential ribs and the longitudinal ribs to the inner surface of each of the segmented inner walls according to the preset positions;

[0007] Step 3: Fix and connect each of the segmented inner walls according to the preset position to form an annular integral inner wall with the circumferential ribs and the longitudinal ribs;

[0008] Step 4: Connect each of the segmented outer walls to the annular inner wall in sequence according to the preset positions to complete the assembly of the large-size rotary cylinder.

[0009] In one embodiment, during the forming process of each of the segmented inner walls, skirts extending inward toward the inner surface are simultaneously formed on both sides of each of the segmented inner walls.

[0010] In step 3, during the process of fixing and connecting the inner walls of each segment according to the preset position, the skirts of the adjacent inner walls of the segment are fixed and connected by bolts.

[0011] In one embodiment, after the skirts of the two adjacent inner walls of the segment are fixedly connected by bolts, a composite material layer is also pasted into the gap where the skirts of the two adjacent inner walls of the segment are connected.

[0012] In one embodiment, in step 2, the circumferential ribs and the longitudinal ribs are fixedly installed on the inner surface of each of the segment inner walls by means of adhesive bonding and / or bolting.

[0013] In one embodiment, after the circumferential ribs and the longitudinal ribs are fixedly installed on the inner surfaces of the inner walls of each segment, a composite material layer is pasted into the connection gap between the circumferential ribs, the longitudinal ribs and the inner walls of the segments.

[0014] In one embodiment, after connecting each of the segmented outer walls to the annular integral inner wall in step 4, a composite material covering layer is also coated on the inner and outer surfaces of the large-size rotating cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] This invention involves shaping the inner and outer walls of the cylinder into segments, then fixing circumferential and longitudinal ribs onto the inner surfaces of each segment's inner wall. The segments are then connected according to preset positions to form a ring-shaped integral inner wall with circumferential and longitudinal ribs. Bolts can then be used to directly fix the segments to their connecting surfaces. This eliminates the need for recessed structures on the inner and outer walls, simplifying the shaping process. Furthermore, the absence of an outer wall obstructing the assembly facilitates connection between the segments, ultimately resulting in a large-size cylinder. This process does not compromise the overall strength of the large-size rotating cylinder, while also improving construction efficiency and reducing costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the assembly method for a large-size rotary cylinder in an embodiment of the present invention.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] 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 positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixation," etc., should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an adhesive connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0025] This embodiment discloses a method for assembling a large-size rotating cylinder, mainly used for assembling and forming large-size rotating cylinders such as the cylinder of a hovercraft duct device and the fairing of a wind turbine. The large-size rotating cylinder is an airfoil-shaped rotating body, including an inner wall, an outer wall, and circumferential and longitudinal ribs disposed between the inner and outer walls.

[0026] refer to Figure 1 The assembly method in this embodiment specifically includes the following steps:

[0027] Step 1: The circumferential ribs and longitudinal ribs are formed separately, and the inner wall and outer wall are formed in segments to obtain several segmented inner walls and segmented outer walls.

[0028] Step 2: Fix each circumferential rib and longitudinal rib to the inner surface of each segment's inner wall according to the preset position;

[0029] Step 3: Fix and connect the inner walls of each segment according to the preset position to form an annular integral inner wall with circumferential ribs and longitudinal ribs;

[0030] Step 4: Connect the outer walls of each segment to the inner wall of the ring according to the preset positions to complete the assembly of the large-size rotary cylinder.

[0031] During the specific process of forming the inner walls of each segment, skirts extending towards the inner surface of the inner wall are simultaneously formed on the left and right sides of each segment. Therefore, when fixing the inner walls of each segment according to the preset positions, the inner walls with circumferential and longitudinal ribs are first placed according to the preset positions, so that the two skirts on adjacent sides of adjacent inner walls overlap, and then bolts are used to connect and fix the two skirts on adjacent sides. This process not only eliminates the need to form a groove structure on the inner walls of the segments, making the forming process more convenient, but also ensures that neither skirt is obstructed by an outer wall when fixing the two skirts on adjacent sides with bolts, facilitating construction operations. This not only does not affect the overall strength of the large-size rotating cylinder, but also improves construction efficiency and reduces construction costs.

[0032] When the assembly method in this embodiment is used for assembling the cylinder of the hovercraft duct device, after forming the annular integral inner wall with circumferential ribs and longitudinal ribs in complete step 3, the flow guide arm and flow guide cover of the duct device are first installed on the inner wall surface of the annular integral inner wall, and then the segmented outer wall assembly in step 4 is carried out. Connecting the flow guide arm and flow guide cover first not only makes the annular integral inner wall more stable, but also makes it easier to observe and check the status of the flow guide arm connecting bolts when there is no outer wall obstruction. It also facilitates the implementation of auxiliary fixing methods, such as applying a protective coating to the outside of the connecting bolts.

[0033] In a preferred embodiment, after the two skirts on adjacent sides are connected and fixed with bolts, a composite material layer is also pasted into the connection gap between the two skirts on adjacent sides to strengthen the connection.

[0034] In the specific implementation of step 2, the circumferential ribs and longitudinal ribs are fixedly installed on the inner surface of the inner wall of each segment by means of adhesive bonding and / or bolt fixing. In addition, a composite material layer is pasted at the connection gap between the circumferential ribs, longitudinal ribs and the inner wall of the segment to strengthen the connection.

[0035] In the specific implementation of step 4, when connecting each segmented outer wall to the annular integral inner wall according to the preset position, structural adhesive is uniformly applied to the outer walls of each circumferential rib and longitudinal rib, as well as the flanges on the upper and lower sides of the annular integral inner wall. Then, each segmented outer wall is connected to the annular integral inner wall in sequence, so that the inner surface of the segmented outer wall is connected and fixed to the outer walls of each circumferential rib and longitudinal rib, as well as the flanges on the upper and lower sides of the annular integral inner wall, thus completing the initial assembly of the large-size rotary cylinder. Then, a composite material covering layer is applied to the inner and outer surfaces of the large-size rotary cylinder, thereby improving the overall structural strength of the large-size rotary cylinder while effectively ensuring the smoothness of the surface of the large-size rotary cylinder.

[0036] In this embodiment, both the inner and outer walls of the segmented structure are sandwich structures consisting of a composite material skin covering a foam core. When the large-size rotating cylinder in this embodiment is used as the cylinder of a hovercraft duct device or a wind turbine fairing, its outer wall and / or inner wall need to be connected to an external support structure. For example, when the large-size rotating cylinder is used as the cylinder of a hovercraft duct device, its outer wall is connected to a fixed base, and its inner wall is connected to multiple flow-guiding arms.

[0037] In this preferred embodiment, the corresponding fixed bases and flow guide arm connections on the inner and outer walls of the segments are made of solid composite material. That is, during the molding process of the inner and outer walls of the segments, the foam core material in the corresponding areas of the solid composite material wall is hollowed out and then filled with composite material. This allows the cylinder to use solid composite material walls in the local connection areas, while the main structure of the inner and outer walls of the cylinder adopts a composite material skin / foam sandwich structure over a large area. While minimizing weight, this greatly enhances the rigidity and strength of the cylinder. As a result, the cylinder does not require any other auxiliary support devices except for the fixed base support at the bottom, which greatly saves space and assembly difficulty.

[0038] More preferably, the connection areas of the corresponding circumferential ribs and longitudinal ribs on the inner and outer walls of the segments can also be set as solid composite material walls, thereby further improving stiffness and strength.

[0039] 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 under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A method for assembling a large-size rotary cylinder, characterized in that, The large-size rotating cylinder is an airfoil-shaped section rotating body, including an inner wall, an outer wall, and circumferential and longitudinal ribs disposed between the inner and outer walls. The assembly method includes the following steps: Step 1: The circumferential ribs and the longitudinal ribs are individually formed, and the inner wall and the outer wall are segmented and formed to obtain several segmented inner walls and segmented outer walls. Step 2: Fix each of the circumferential ribs and the longitudinal ribs to the inner surface of each of the segmented inner walls according to the preset positions; Step 3: Fix and connect each of the segmented inner walls according to the preset position to form an annular integral inner wall with the circumferential ribs and the longitudinal ribs; Step 4: Connect each of the segmented outer walls to the annular integral inner wall in sequence according to the preset position to complete the assembly of the large-size rotary cylinder; During the forming process of each segmented inner wall, skirts extending inward to the inner surface are formed simultaneously on both sides of each segmented inner wall; in step 3, during the process of fixing and connecting each segmented inner wall according to a preset position, the skirts of adjacent segmentsed inner walls are fixedly connected by bolts.

2. The method for assembling a large-size rotary cylinder according to claim 1, characterized in that, After the skirt edges of the two adjacent inner walls of the segment are fixedly connected by bolts, a composite material layer is also pasted into the gap where the skirt edges of the two adjacent inner walls of the segment are connected.

3. The method for assembling a large-size rotary cylinder according to claim 1 or 2, characterized in that, In step 2, the circumferential ribs and the longitudinal ribs are fixedly installed on the inner surface of the inner wall of each segment by means of adhesive bonding and / or bolting.

4. The method for assembling a large-size rotary cylinder according to claim 3, characterized in that, After the circumferential ribs and longitudinal ribs are fixedly installed on the inner surfaces of the inner walls of each segment, a composite material layer is pasted into the connection gap between the circumferential ribs, longitudinal ribs and the inner walls of the segments.

5. The method for assembling a large-size rotary cylinder according to claim 1 or 2, characterized in that, In step 4, after connecting each of the segmented outer walls to the inner wall of the annular integral body, a composite material covering layer is also coated on the inner and outer surfaces of the large-size rotating cylinder.

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