Parallel hanger made of carbon fiber composite material

Abstract

The invention discloses a carbon fiber composite material parallel hanging rack, and relates to the technical field of aerospace, the carbon fiber composite material parallel hanging rack comprises a bottom shell, the bottom shell comprises a front bottom plate, a middle bottom plate and a rear bottom plate, and two mounting ports are formed between the front bottom plate and the middle bottom plate and between the rear bottom plate and the middle bottom plate; the frame beams and the supporting plates are matched to form a parallel-connection hanging frame structure to guarantee the mechanical property, meanwhile, a carbon fiber composite material is adopted to replace a traditional aluminum alloy material, and the self weight of the parallel-connection hanging frame can be greatly reduced; therefore, the invalid load of the air carrier is directly reduced, the load capacity is improved, and the problems that the air carrier system efficiency and the load capacity are poor due to the fact that the weight of a traditional hanging frame is large, and if the weight of the hanging frame is directly reduced by replacing light materials, the strength is insufficient, and deformation is too large under the high-load and complex working conditions are solved. And the load capacity and the working efficiency of an aerial carrier are improved.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, specifically to a parallel hanger made of carbon fiber composite material. Background Technology

[0002] In the fields of aviation and aerospace, product lightweighting is of great significance for improving overall performance and reducing energy consumption and costs. As a key structural component of the airborne carrier, the weight of the rack directly affects the efficiency and load capacity of the entire system. Although traditional aluminum alloy racks have certain strength and corrosion resistance, their weight has become a bottleneck for optimization in the pursuit of higher performance. The heavy weight of traditional hangars results in poor efficiency and load capacity of aerial carrier systems. If the hangar is simply replaced with lighter materials to reduce its weight, it may suffer from insufficient strength and excessive deformation under high loads and complex working conditions. This makes it difficult for traditional hangars to significantly reduce their weight while maintaining mechanical performance, leading to poor load capacity and working efficiency of the aerial carrier. Summary of the Invention

[0003] To address the above problems, this invention provides a parallel hanging bracket made of carbon fiber composite material, which solves the aforementioned issues.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a carbon fiber composite parallel hanger, comprising a bottom shell, the bottom shell comprising a front bottom plate, a middle bottom plate, and a rear bottom plate, wherein two mounting openings are provided between the front bottom plate and the rear bottom plate and the middle bottom plate, and two bottom plate coveres are connected between the front bottom plate and the rear bottom plate and the middle bottom plate; Two support plates are connected to one side of the bottom shell. The two support plates are respectively connected to the two sides of the two mounting ports. A frame beam is connected to one side of the two support plates. Both frame beams are set at the mounting ports. Both sides of the two beams are fixedly connected with extension lugs, the extension lugs are provided with grooves, the grooves are connected with connectors, the top of the beams are provided with connection ports, and the sides of the beams are provided with cable holes.

[0005] Preferably, both of the frame beams are carbon fiber composite sandwich structures, and the middle of the sandwich of the two frame beams is a closed cavity with PMI foam pre-embedded in the cavity.

[0006] Preferably, a weight-reducing opening is provided on one side of the support plate, and the weight-reducing opening corresponds to the cable hole.

[0007] Preferably, a front fairing is connected to one side of the front base plate, a rear fairing is connected to one side of the rear base plate, an upper housing is connected between the front fairing and the rear fairing, and the two sides of the upper housing are connected to the base shell.

[0008] Preferably, two openings are provided on one side of the upper housing, and the two openings correspond to the connection ports, with lifting lugs connected to the openings and the connection ports.

[0009] Preferably, the upper shell is a composite material sandwich structure, and PMI foam is pre-embedded in the sandwich between the two passages.

[0010] Preferably, the upper housing has positioning openings on both sides, and the positioning openings are located on the outside of the beam.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This application ensures mechanical performance by using a parallel hanger structure composed of beams and support plates. At the same time, the use of carbon fiber composite materials to replace traditional aluminum alloy materials can significantly reduce the weight of the parallel hanger itself. This directly reduces the ineffective load on the aerial carrier, improves the overall system load capacity, and reduces the energy consumption of the aerial carrier. It solves the problems of insufficient strength and excessive deformation under high load and complex working conditions caused by the heavy weight of traditional hangers. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the upper shell structure of the present invention; Figure 3 This is a schematic diagram of the beam-girder structure of the present invention; Figure 4 This is a schematic diagram of the support plate structure of the present invention; Figure 5 This is a schematic diagram of the upper shell structure of the present invention; Figure 6 This is a schematic diagram of the bottom shell structure of the present invention.

[0013] The diagram shows the following labels: 1. Bottom shell; 101. Front bottom plate; 102. Middle bottom plate; 103. Rear bottom plate; 104. Mounting port; 105. Bottom plate cover; 2. Support plate; 3. Weight reduction port; 4. Frame beam; 5. Extension lug; 6. Groove; 7. Connector; 8. Connection port; 9. Cable hole; 10. Front fairing; 11. Rear fairing; 12. Upper shell; 13. Exit; 14. Lifting lug; 15. Positioning port. Detailed Implementation

[0014] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0015] Please see Figure 6 A parallel rack made of carbon fiber composite material is introduced. Traditional aluminum alloy racks often need to increase the wall thickness or add reinforcing ribs to meet strength requirements, but this will lead to redundant weight. However, by using the high strength and on-demand lay-up of carbon fiber composite material, the thickness of the rack can be controlled within a relatively thin range. With the support of PMI foam core material, the overall weight can be significantly reduced. At the same time, because carbon fiber material has higher stiffness, the deflection when suspending the same weight of object is also significantly reduced compared to aluminum alloy, thereby improving the stability of suspended objects when transporting them in the air. Carbon fiber has a tensile strength of 3000-7000MPa and an elastic modulus of about 200-500GPa, while its density is only 1.7-2.0g / cm³, which is much lower than that of metal materials. This significant advantage in strength-to-weight ratio and stiffness-to-weight ratio is the core prerequisite for achieving lightweight racks. Compared with traditional metals such as aluminum alloy frames, carbon fiber composite materials can reduce weight by 30%-50% under the same load-bearing capacity, directly reducing fuel consumption and flight load of aerial vehicles. Furthermore, during flight, the pylons bear dynamic loads such as engine vibration and airflow disturbances. Aluminum alloys have a low damping ratio (approximately 0.001-0.005), which easily leads to resonance and amplification of vibration amplitude, causing the suspension to loosen. In contrast, carbon fiber composite materials have a damping ratio 3-5 times that of aluminum alloys (approximately 0.005-0.02), which can quickly attenuate vibration energy and reduce vibration damage to components such as cables and connectors 7 caused by vibrations during flight. This includes the bottom shell 1, which comprises a front bottom plate 101, a middle bottom plate 102, and a rear bottom plate 103. The front bottom plate 101 and the rear bottom plate 103 are connected to the middle bottom plate 102 and the middle bottom plate 103. Two mounting openings 104 are provided between the plates 102. Two bottom plate covers 105 are connected between the front bottom plate 101 and the rear bottom plate 103 and the middle bottom plate 102. The front bottom plate 101, the middle bottom plate 102, and the rear bottom plate 103 together form the bottom shell 1 through the two bottom plate covers 105, ensuring the sealing of the bottom shell 1. At the same time, the front bottom plate 101, the middle bottom plate 102, and the rear bottom plate 103 are all connected to the upper shell 12, and the front bottom plate 101 and the rear bottom plate 103 are also connected to the front fairing 10 and the rear fairing 11. Therefore, although the bottom shell 1 is divided into several parts, it will not affect the stability of the bottom shell 1. Please see Figure 2 Two support plates 2 are connected to one side of the bottom shell 1. The two support plates 2 are respectively connected to the two sides of the two mounting ports 104. A frame beam 4 is connected to one side of the two support plates 2. Both frame beams 4 are set at the mounting ports 104. The frame beams 4 are installed at the mounting ports 104 and are positioned and fixed by the support plates 2. Because cable holes 9 are provided on both sides of the frame beams 4 for cable arrangement, the weight reduction port 3 of the support plate 2 needs to correspond to the cable hole 9 of the frame beam 4 so that the cable can pass through the weight reduction port 3 of the support plate 2 and the cable hole 9 of the frame beam 4 at the same time. It should be added that the weight reduction port 3 not only provides space for cable arrangement, but also reduces the weight of the support plate 2 without affecting the overall structural strength of the bracket, thereby reducing the weight of the bracket. Please see Figure 1 , Figure 2 , Figure 3 Both sides of the two frame beams 4 are fixedly connected with extension lugs 5. The extension lugs 5 have grooves 6, and the grooves 6 are connected with connectors 7. The two frame beams 4 are arranged one in front of the other and cooperate with other components to form a parallel hanging frame. The top of the parallel hanging frame is connected to the air carrier, and the two parallel hanging frames are connected to the guide rail assembly (the guide rail assembly is used to hang and lock the suspended object) through the extension lugs 5 of the two frame beams 4. Specifically, the beam 4 is connected and fixed to the guide rail assembly by connecting the connecting piece 7 through the extended ear piece 5. The top of the beam 4 is provided with a connection port 8, and the two sides of the beam 4 are provided with cable holes 9.

[0016] Both beams 4 are carbon fiber composite sandwich structures. The middle of the sandwich of the two beams 4 is a closed cavity with PMI foam embedded in the cavity. The sandwich structure of carbon fiber and PMI foam core is not a simple material superposition, but a performance advantage is amplified through the coupling of structure and material. Specifically, carbon fiber material, as the outer load-bearing structure, directly bears tensile, compressive, and shear loads. Due to the anisotropic nature of carbon fiber material, the design uses staggered multi-directional layups such as 0° and 45° to balance the force requirements in different directions. The area of ​​the top connection port 8 of the beam 4 needs to bear the vertical load transmitted by the lifting lug 14, so the proportion of fibers in the 0° direction needs to be increased along the length of the beam to enhance tensile strength. The two side extension lugs 5 are connected to the guide rail assembly and bear the lateral shear force, so the shear resistance needs to be improved by 45° layup. At the same time, PMI foam creates a distance effect for the carbon fiber material through the sandwich structure, just like the flange of an I-beam achieves improved bending stiffness through separation of the web. The carbon fiber material in the sandwich structure is separated by PMI foam, which can significantly improve the bending and torsional stiffness of the overall structure with the same amount of material. This is suitable for the front-end load-bearing condition when the beam 4 is used to suspend heavy objects, and reduces the deformation of the beam 4 during operation. The combination of carbon fiber composite sandwich structure and pre-embedded PMI foam is the key component for achieving a balance between lightweight and structural performance in beam 4; Specifically, the carbon fiber composite panel itself is relatively thin and is prone to buckling deformation when subjected to stress alone. PMI foam is filled in the closed cavity and can support the carbon fiber composite panel like a skeleton. It can evenly transfer the weight of the external load suspended to the carbon fiber composite panel and avoid the failure of the beam 4 structure caused by local stress concentration. More specifically, compared to filling the cavity with metal or solid composite materials, PMI foam has an extremely low density. While ensuring that the structural strength and stiffness are not reduced, it can minimize the overall weight of the beam 4, thereby achieving weight reduction of the parallel hangers.

[0017] Please see Figure 4 The support plate 2 has a weight reduction opening 3 on one side, which corresponds to the cable hole 9.

[0018] A front fairing 10 is connected to one side of the front base plate 101, and a rear fairing 11 is connected to one side of the rear base plate 103. An upper shell 12 is connected between the front fairing 10 and the rear fairing 11. The two sides of the upper shell 12 are connected to the bottom shell 1. The front fairing 10 and the rear fairing 11 are designed to allow airflow to pass smoothly, thereby reducing the aerodynamic drag of the airborne carrier when carrying parallel racks.

[0019] Two openings 13 are provided on one side of the upper shell 12. The two openings 13 correspond to the connection port 8. Lifting lugs 14 are connected in the openings 13 and the connection port 8. Although the raw material cost of carbon fiber composite material is 3-5 times that of aluminum alloy, the life cycle cost of carbon fiber composite material is lower. The repair rate of aluminum alloy due to fatigue cracks is 4-6 times that of carbon fiber. Especially in stress concentration parts such as lifting lugs 14 and connection port 8, the low maintenance requirement of carbon fiber significantly reduces maintenance costs. Therefore, considering the long-term performance of carbon fiber composite material, it has a cost advantage. The lifting lugs 14 connect and fix the upper shell 12 to the frame beam 4 through the openings 13 and the connection port 8. The lifting lugs 14 are made of 30CrMnSiA heat treatment followed by cadmium plating passivation. The upper part is hung with the air carrier and works with the stopper of the air carrier to achieve six degrees of freedom constraint on the parallel hanger. The stopper of an airborne vehicle is a well-known technology, and those skilled in the art can and should understand its specific functions and structure, so it will not be described in detail here.

[0020] The upper shell 12 is a composite material sandwich structure, and PMI foam is pre-embedded in the sandwich between the two openings 13.

[0021] Please see Figure 5 The upper housing 12 has positioning ports 15 on both sides. The positioning ports 15 are located on the outside of the frame beam 4 and correspond to the frame beam 4. In this way, when the upper housing 12 is closed to the parallel hanger, the positioning ports 15 will reach both sides of the frame beam 4, so that the installation of the upper housing 12 will not interfere with the frame beam 4.

[0022] When using this invention: First, the front bottom plate 101, the middle bottom plate 102, and the rear bottom plate 103 together form the bottom shell 1 through two bottom plate covers 105, ensuring the sealing of the bottom shell 1. At the same time, the front bottom plate 101, the middle bottom plate 102, and the rear bottom plate 103 are all connected to the upper shell 12, and the front bottom plate 101 and the rear bottom plate 103 are also connected to the front fairing 10 and the rear fairing 11. Secondly, the beam 4 is installed at the mounting port 104 and positioned and fixed by the support plate 2. Since cable holes 9 are provided on both sides of the beam 4 for cable arrangement, the weight reduction port 3 of the support plate 2 needs to correspond to the cable holes 9 of the beam 4 so that the cable can pass through both the weight reduction port 3 of the support plate 2 and the cable holes 9 of the beam 4 at the same time. The weight reduction port 3 can not only provide space for cable arrangement, but also reduce the weight of the support plate 2 without affecting the overall structural strength of the bracket, thereby reducing the weight of the bracket. Then, all beams 4 are made of carbon fiber composite sandwich structures. The carbon fiber composite sandwich structure, together with the pre-embedded PMI foam, is the key component for beams 4 to achieve a balance between lightweight and structural performance. The carbon fiber composite panel itself is relatively thin and is prone to buckling deformation when subjected to stress alone. The PMI foam is filled in the closed cavity and can support the carbon fiber composite panel like a skeleton. It can evenly transfer the weight of the external load suspended to the carbon fiber composite panel and avoid structural failure of beams 4 caused by local stress concentration. Meanwhile, compared to filling the cavity with metal or solid composite materials, PMI foam has an extremely low density, which can reduce the overall weight of the beam 4 to the maximum extent while ensuring that the structural strength and stiffness are not reduced, thereby achieving weight reduction of the parallel hangers. Finally, the lifting lug 14 connects and fixes the upper shell 12 to the frame beam 4 through the through port 13 and the connecting port 8. The lifting lug 14 is made of 30CrMnSiA heat treatment followed by cadmium passivation. Its upper part is hung with the air carrier and works with the stopper of the air carrier to achieve six degrees of freedom constraint on the parallel hanger. The two frame beams 4 are arranged one in front of the other and cooperate with other components to form a parallel hanger. The top of the parallel hanger is connected to the air carrier, and the two parallel hangers are connected to the guide rail assembly (the guide rail assembly is used to hang and lock the suspended object) through the extension lugs 5 of the two frame beams 4. Specifically, the connection and fixation of the frame beam 4 and the guide rail assembly is achieved by the connector 7 passing through the extension lugs 5 and connecting to the guide rail assembly.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A parallel hanging rack made of carbon fiber composite material, comprising a bottom shell (1), wherein the bottom shell (1) comprises a front bottom plate (101), a middle bottom plate (102), and a rear bottom plate (103), characterized in that: Two mounting openings (104) are provided between the front bottom plate (101) and the rear bottom plate (103) and the middle bottom plate (102), and two bottom plate covers (105) are connected between the front bottom plate (101) and the rear bottom plate (103) and the middle bottom plate (102). Two support plates (2) are connected to one side of the bottom shell (1). The two support plates (2) are respectively connected to the two sides of the two mounting ports (104). A frame beam (4) is connected to one side of the two support plates (2). Both frame beams (4) are located at the mounting ports (104). Both sides of the two beams (4) are fixedly connected with extension lugs (5), and the extension lugs (5) are provided with grooves (6). A connector (7) is connected in the grooves (6). A connection port (8) is provided on the top of the beams (4), and cable holes (9) are provided on both sides of the beams (4).

2. The parallel hanging bracket of carbon fiber composite material according to claim 1, characterized in that: Both of the beams (4) are carbon fiber composite sandwich structures, and the middle of the sandwich of the two beams (4) is a closed cavity with PMI foam embedded in the cavity.

3. The parallel hanging bracket of carbon fiber composite material according to claim 1, characterized in that: The support plate (2) has a weight reduction opening (3) on one side, which corresponds to the cable hole (9).

4. A parallel hanging bracket made of carbon fiber composite material according to claim 1, characterized in that: A front fairing (10) is connected to one side of the front base plate (101), and a rear fairing (11) is connected to one side of the rear base plate (103). An upper shell (12) is connected between the front fairing (10) and the rear fairing (11), and the two sides of the upper shell (12) are connected to the bottom shell (1).

5. A parallel hanging bracket made of carbon fiber composite material according to claim 4, characterized in that: Two openings (13) are provided on one side of the upper shell (12). The two openings (13) correspond to the connection port (8). A lifting lug (14) is connected to the opening (13) and the connection port (8).

6. A parallel hanging bracket made of carbon fiber composite material according to claim 5, characterized in that: The upper shell (12) is a composite material sandwich structure, and PMI foam is pre-embedded in the sandwich between the two passages (13).

7. A parallel hanging bracket made of carbon fiber composite material according to claim 6, characterized in that: The upper shell (12) has positioning ports (15) on both sides, and the positioning ports (15) are located outside the beam (4).

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