Secondary glued full-height foam structure unmanned aerial vehicle elevator

Abstract

The utility model discloses a secondary glued full-height foam structure unmanned aerial vehicle elevator which comprises an upper wall plate, a lower wall plate and a beam, wherein the upper wall plate, the lower wall plate and the beam are of a composite material laminated structure. Front edge areas are arranged at the front ends of the upper wall plate and the lower wall plate, the beam is located in the front edge areas of the upper wall plate and the lower wall plate, the space between the upper wall plate and the lower wall plate is filled with a full-height foam core, the upper wall plate, the lower wall plate and the beam form an elevator, end partition plates are arranged at the two ends of the elevator, a control connector is arranged at one end of the elevator, and a front edge partition plate and a suspension connector are arranged on the beam. And the rear ends of the upper wall plate and the lower wall plate as well as the front edge areas of the upper wall plate and the lower wall plate and the beam are in secondary cementing connection through medium-temperature adhesive films. And the structural integrity is good, the structural weight is reduced, fastener connection is reduced, the process assembly amount is reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of elevator structures and relates to a secondary-bonded full-height foam structure unmanned aerial vehicle elevator. Background Art

[0002] Currently, advanced composite materials have been widely used in drones, some of which are even entirely composite. Composite structural design and process optimization have also become key technologies in the development of drones. Elevator structures have high requirements for stability, maneuverability, and reliability. Compared with metal structures, composite structural designs offer greater stiffness, lower weight, lower moment of inertia, higher structural efficiency, and longer lifespan. Composite elevator structures mostly employ honeycomb sandwich panels, single beams, and a few ribs, or laminated panels, single beams, and dense ribs. However, in both structures, the panels, beams, and ribs are connected mechanically with fasteners or by room-temperature bonding. Mechanical fasteners require a large assembly workload, and room-temperature bonded components have poor performance. These factors hinder the integrated design, lifespan improvement, weight reduction, and cost reduction of composite structures. Utility Model Content

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a full-height foam structure UAV elevator with secondary bonding, which has good structural integrity, is conducive to reducing structural weight, reducing fastener connections, reducing process assembly volume, and reducing manufacturing costs.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A secondary bonded full-height foam structure UAV elevator, comprising an upper wall panel, a lower wall panel and a beam of a composite laminated structure;

[0006] The upper and lower panels are provided with a leading edge area at the front end thereof, the beam is located in the leading edge area of ​​the upper and lower panels, the space between the upper and lower panels is filled with a full-height foam core, the upper and lower panels and the beam form an elevator, both ends of the elevator are provided with end bulkheads, one end of which is provided with a control joint, and the beam is provided with a leading edge bulkhead and a suspension joint;

[0007] The rear ends of the upper and lower wall panels, the leading edge areas of the upper and lower wall panels and the beams are all connected by secondary bonding using medium-temperature adhesive film.

[0008] Preferably, the upper wall panel and the lower wall panel are integrally formed with their respective leading edge regions.

[0009] Preferably, the full height foam is polyurethane closed cell rigid foam.

[0010] Preferably, a plurality of leading edge baffles and a plurality of suspension joints are arranged at intervals on the beam, and at least one leading edge baffle is arranged between two adjacent suspension joints.

[0011] Furthermore, there are three suspension joints, one of which is located at the center of the beam, and the other two suspension joints are located near both ends of the beam.

[0012] Furthermore, the multiple suspension joints have the same structure, and the multiple leading edge partitions have the same structure.

[0013] Preferably, the upper wall plate and the lower wall plate form equal straight cross sections.

[0014] Preferably, the rear ends of the upper wall plate and the lower wall plate are trailing edge areas, and the end areas of the trailing edge areas are flat plate areas.

[0015] Preferably, the end partition, the leading edge partition, the suspension joint and the control joint are all made of metal.

[0016] Preferably, the end diaphragms, leading edge diaphragms, suspension joints and steering joints are mechanically connected to the beams using fasteners.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The secondary bonding manufacturing method of the utility model is integrally formed, which is beneficial to the application of composite materials, has good structural integrity, is beneficial to reducing structural weight, reducing fastener connections, reducing process assembly volume, and reducing manufacturing costs. Compared with the co-curing process, it reduces manufacturing difficulty and manufacturing cost. Compared with the liquid molding process, it improves the structural mechanical properties and reliability. The full-height foam core is low in cost compared to the honeycomb structure and has better processing performance and bonding quality.

[0019] Furthermore, the upper wall panel and the lower wall panel are not segmented from the leading edge area, which can reduce assembly time.

[0020] Furthermore, multiple suspension joints are identical parts, and multiple leading edge partitions are identical parts, which reduces parts design, simplifies the structure, reduces manufacturing workload, and saves manufacturing costs.

[0021] Furthermore, the trailing edge areas of the upper and lower wall panels are designed to be straight, making them easy to directly glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the secondary-bonded full-height foam structure UAV elevator of the utility model.

[0023] Figure 2 This is a schematic diagram of the composite wall panel structure of the full-height foam structure UAV elevator with secondary bonding according to the utility model.

[0024] Figure 3 This is a schematic diagram of the full-height foam structure of the secondary-bonded full-height foam structure UAV elevator of the utility model.

[0025] Figure 4 This is a schematic diagram of the beam and partition structure of the full-height foam structure UAV elevator with secondary bonding in accordance with the present invention.

[0026] Figure 5 This is a schematic structural diagram of the suspension joint of the full-height foam structure UAV elevator with secondary bonding according to the utility model.

[0027] Figure 6 This is a schematic structural diagram of the end bulkhead of the full-height foam structure UAV elevator with secondary bonding according to the present invention.

[0028] Figure 7 This is a schematic structural diagram of the control joint of the full-height foam structure UAV elevator with secondary bonding according to the utility model.

[0029] Explanation of numbers in the figure: 1-upper wall panel, 2-full height foam core, 3-lower wall panel, 4-beam, 5-suspension joint, 6-leading edge bulkhead, 7-end bulkhead, 8-manipulation joint. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected, electrically connected, or able to communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internally connected between two elements or an interactive relationship between two elements. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances. The terms used herein in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model.

[0033] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0034] like Figure 1 As shown, the secondary bonded full-height foam structure UAV elevator described in the present invention comprises an upper wall panel 1, a full-height foam core 2, a lower wall panel 3, a beam 4, a suspension joint 5, a leading edge partition 6, an end partition 7 and a control joint 8.

[0035] like Figure 2 As shown, the upper wall panel 1 and the lower wall panel 3 are composite laminated integral wall panels, and the leading edge areas of the upper wall panel 1 and the lower wall panel 3 are integrated structures, which are integral wall panels. Therefore, the leading edge areas of the upper wall panel 1 and the lower wall panel 3 are not segmented, and the beam connection area, foam area, leading edge area, and trailing edge area of ​​the wall panel have different thicknesses. Figure 3 As shown, the full-height foam 2 is a closed-cell rigid polyurethane foam with a recessed profile to align with the wall panels. The beam 4 is a composite laminate structure, while the double-ear suspension joint 5, leading edge bulkhead 6, end bulkhead 7, and double-ear control joint 8 are metal structures. Using a medium-temperature, secondary adhesive bonding process, the entire structure is formed with minimal fasteners in critical load-carrying areas. This results in excellent structural integrity, high rigidity, and minimal assembly effort. While meeting design requirements, this reduces structural weight, improves structural lifespan, and reduces operational costs.

[0036] The leading edge area is arranged with multiple leading edge baffles in a 6-dimensional shape, such as Figure 4 As shown, a plurality of leading edge partitions 6 are spaced apart and arranged on the beam 4. The beam 4 is also provided with a plurality of suspension joints 5 for connecting the elevator structure. The structure of the suspension joint 5 is as shown in FIG. Figure 5 As shown, at least one leading edge partition 6 is provided between two adjacent suspension joints 5. In this embodiment, there are three suspension joints 5, one of which is located at the center of the beam 4, and the other two suspension joints 5 are located near both ends of the beam 4.

[0037] The upper wall plate 1, the lower wall plate 3 and the beam 4 form an elevator. The elevator is provided with end partitions 7 at both ends, one end of which is provided with a control joint 8. The structure of the end partition 7 is as follows: Figure 6 As shown, there are two end partitions 7, which are located at one end of the elevator and are used to support the end of the elevator and connect the upper wall plate 1, the lower wall plate 3 and the end of the beam 4. The structure of the operating joint 8 is as shown in FIG. Figure 7 As shown, there is one control joint 8 located at one end of the elevator, and support and deflection of the elevator structure are achieved through three suspension joints 5 and one control joint 8.

[0038] The metal structure's end partition 7, leading edge partition 6, three suspension joints 5 and one control joint 8 are mechanically connected to the composite laminate structure's beam 4 with a small number of fasteners to form a front beam assembly, which is then bonded to the upper wall panel 1, full-height foam 2 and lower wall panel 3 for a secondary bonding process using a medium-temperature adhesive film to form the entire assembly, thereby improving the structural integrity and stability while reducing the structural weight.

[0039] The elevator has a uniform straight cross-section, which facilitates the universal design of internal parts. The composite upper wall panel 1 and the lower wall panel 3 are both integral wall panels. The leading edge area is not segmented, and the thickness varies along the span direction and the heading direction. The 20mm area at the end of the trailing edge area is a flat plate area. The upper wall panel 1 and the lower wall panel 3 are directly bonded at the trailing edge for a second time, without the need to design a tail strip for support. The structure is simple and easy to manufacture. The rear part is light in weight, which is conducive to moving the center of gravity forward and reducing the moment of inertia, thereby improving the structural efficiency.

[0040] The inner core material between the composite materials is a full-height foam structure, which is located behind the beam 4 and completely fills the space between the upper wall panel 1 and the lower wall panel 3. There is no need to design a rib structure inside, thereby achieving the purpose of weight reduction, improving the structural rigidity of the rudder and the stability of the wall panel. Compared with honeycomb core materials, foam is easier to process, has better bonding quality, is cheaper than honeycomb, and is easy to reduce costs.

[0041] like Figure 5 As shown, the metal suspension joint 5 and the metal leading edge partition 6 are both identical parts, which reduces the number of parts designed, simplifies the structure, reduces the manufacturing workload, and saves manufacturing costs.

[0042] The beam assembly formed by the end partition 7, leading edge partition 6, suspension joint 5 and control joint 8 of the metal structure and the composite beam 4 is integrally formed by secondary bonding with the composite upper wall panel 1, full-height foam core 2 and lower wall panel 3, thereby improving the integrated design of the composite structure. While meeting relevant requirements, the process difficulty is reduced compared to overall co-curing molding, and the structural quality and mechanical properties are improved compared to liquid molding.

[0043] The upper wall panels 1 and lower wall panels 3 of the present invention are not segmented from the leading edge area, reducing assembly requirements. The upper wall panels 1 and lower wall panels 3 of the trailing edge area are directly glued together, eliminating the need for tail strip structural support, reducing rear weight and facilitating a reduction in moment of inertia. Furthermore, the entire rudder surface is a uniform straight cross-section, with multiple suspension joints 5 being identical metal parts, and multiple leading edge partitions 6 being identical parts, achieving a universal design for metal parts. A full-height foam core 2 is employed behind the beam 4, with no internal rib structure, reducing the number and type of parts, improving the rigidity of the rudder surface and the stability of the wall panels, resulting in a light weight and high structural efficiency. The straight design of the trailing edge area of ​​the upper wall panels 1 and lower wall panels 3 facilitates direct gluing. Compared to honeycomb structures, the full-height foam core 2 is low-cost and has better processing performance and gluing quality. The overall molding is achieved by the secondary bonding manufacturing method, which is beneficial to the application of composite materials, has good structural integrity, is conducive to reducing structural weight, reduces fastener connections, reduces process assembly volume, and reduces manufacturing costs. Compared with the co-curing process, it reduces manufacturing difficulty and manufacturing costs, and compared with the liquid molding process, it improves the structural mechanical properties and reliability.

[0044] The utility model provides a secondary bonded full-height foam structure UAV elevator and a manufacturing method thereof, which meet the load transmission requirements, stiffness, strength and fatigue requirements, have a simple structure, light weight, a forward center of gravity, a small moment of inertia, excellent structural performance, a long service life and low cost.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0046] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicant did not consider such subject matter to be part of the disclosed utility model subject matter.

Claims

1. A secondary bonded full-height foam structure UAV elevator, characterized by: It comprises an upper wall plate (1), a lower wall plate (3) and a beam (4) of a composite material laminated structure; The front ends of the upper wall plate (1) and the lower wall plate (3) are provided with a leading edge area, the beam (4) is located in the leading edge area of ​​the upper wall plate (1) and the lower wall plate (3), the upper wall plate (1) and the lower wall plate (3) are filled with a full-height foam core (2), the upper wall plate (1), the lower wall plate (3) and the beam (4) form an elevator, both ends of the elevator are provided with end partitions (7), one end of which is provided with a control joint (8), and the beam (4) is provided with a leading edge partition (6) and a suspension joint (5); The rear ends of the upper wall plate (1) and the lower wall plate (3), the front edge areas of the upper wall plate (1) and the lower wall plate (3) and the beam (4) are all connected by secondary bonding using a medium-temperature adhesive film.

2. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: The upper wall plate (1) and the lower wall plate (3) are integrally formed with their respective leading edge areas.

3. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: The full height foam core (2) is polyurethane closed cell rigid foam.

4. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: A plurality of leading edge partitions (6) and a plurality of suspension joints (5) are arranged at intervals on the beam (4), and at least one leading edge partition (6) is arranged between two adjacent suspension joints (5).

5. The secondary bonded full-height foam structure UAV elevator according to claim 4, characterized in that: There are three suspension joints (5), one of which is located at the center of the beam (4), and the other two suspension joints (5) are located near the two ends of the beam (4).

6. The secondary bonded full-height foam structure UAV elevator according to claim 4, characterized in that: The plurality of suspension joints (5) have the same structure, and the plurality of leading edge partitions (6) have the same structure.

7. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: The upper wall plate (1) and the lower wall plate (3) form a straight section.

8. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: The rear ends of the upper wall plate (1) and the lower wall plate (3) are the trailing edge areas, and the end areas of the trailing edge areas are flat plate areas.

9. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: The end partition (7), the leading edge partition (6), the suspension joint (5) and the control joint (8) are all made of metal.

10. The secondary bonded full-height foam structure UAV elevator according to claim 1, characterized in that: The end partition (7), the leading edge partition (6), the suspension joint (5) and the control joint (8) are mechanically connected to the beam (4) using fasteners.

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