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CN-122009561-A - Unmanned aerial vehicle horn, manufacturing method and horn assembly

CN122009561ACN 122009561 ACN122009561 ACN 122009561ACN-122009561-A

Abstract

The application relates to an unmanned aerial vehicle horn, a manufacturing method and a horn assembly. The unmanned aerial vehicle horn is an aluminum tube carbon fiber composite structure, and comprises an aluminum inner tube, a carbon fiber outer layer and an interface bonding layer, wherein the aluminum inner tube is used as a bearing framework to provide main bending rigidity and compressive strength and is used as an installation base connected with a machine body and a motor, the carbon fiber outer layer is coated on the outer surface of the aluminum inner tube to provide circumferential constraint and torsional rigidity and bear part of bending load, and the interface bonding layer is positioned between the aluminum inner tube and the carbon fiber outer layer to provide reliable connection and load transmission between the aluminum inner tube and the carbon fiber. The unmanned aerial vehicle arm obviously reduces the weight and the manufacturing cost of the arm and improves the connection performance of the arm, the machine body and the motor on the premise of ensuring the structural strength and the rigidity. According to the application, the aluminum pipe is adopted as a main body bearing structure, and the carbon fiber is adopted as a reinforcing layer, so that compared with a full carbon fiber scheme, the consumption of the carbon fiber is reduced by 60% -80%, and the material cost is correspondingly reduced by 40% -60%.

Inventors

  • Request for anonymity
  • Request for anonymity

Assignees

  • 盛世鲲鹏智航(广东)控股有限公司

Dates

Publication Date
20260512
Application Date
20260214

Claims (11)

  1. 1. An unmanned aerial vehicle arm is used for connecting an unmanned aerial vehicle body and a motor and is characterized in that the unmanned aerial vehicle arm is of an aluminum tube carbon fiber composite structure and comprises an aluminum inner tube, a carbon fiber outer layer and an interface bonding layer, The aluminum inner pipe is used as a bearing framework to provide main bending rigidity and compressive strength and is used as an installation foundation connected with a machine body and a motor; The carbon fiber outer layer is coated on the outer surface of the aluminum inner tube to serve as a reinforcing layer for providing circumferential constraint and torsional rigidity; the interface bonding layer is an adhesive structure formed by curing an adhesive and used for reliably connecting the aluminum inner tube and the carbon fiber and transmitting load.
  2. 2. The unmanned aerial vehicle horn of claim 1, wherein: The outer surface of the aluminum inner tube has a surface roughness Ra of 1.6-6.3 mu m so as to enhance the bonding strength with the outer layer of the carbon fiber; the outer surface of the aluminum inner pipe is provided with a predetermined roughness by surface treatment; the surface treatment includes an anodic oxidation treatment or a sand blasting treatment.
  3. 3. The unmanned aerial vehicle horn of claim 1, wherein: Winding or layering carbon fiber prepreg to form, and coating the carbon fiber outer layer on the outer surface of the aluminum inner pipe; The volume content of the fiber in the carbon fiber outer layer is 55-65%.
  4. 4. The unmanned aerial vehicle horn of claim 3, wherein: The fiber layering angle of the carbon fiber outer layer is one or a combination of more than 0 degree (+/-45 degrees) and 90 degrees; the carbon fiber adopted by the carbon fiber outer layer has a tensile modulus of 230-250GPa and/or a tensile strength of 3500-5000MPa.
  5. 5. The unmanned aerial vehicle horn according to claim 1, wherein the thickness of the wall of the aluminum inner tube is 1.5-3 times the thickness of the carbon fiber outer layer, and the ratio of the outer diameter of the aluminum inner tube to the total outer diameter of the horn is 0.6-0.8, so that the weight and the rigidity of the horn are ensured.
  6. 6. The unmanned aerial vehicle horn according to claim 1, wherein the two ends of the horn are respectively provided with a connecting interface, one end of the horn is a machine body connecting end, the connecting interface is integrally processed or welded with the aluminum inner tube through an aluminum alloy flange plate, and the other end of the horn is a motor mounting end, and the connecting interface is connected with the aluminum inner tube through an aluminum alloy end cover in a threaded mode or riveted mode.
  7. 7. The unmanned aerial vehicle horn according to any one of claims 1 to 6, wherein: The pipe wall of the aluminum inner pipe is provided with a plurality of through holes, and the aperture, the number and the distribution of the through holes are optimally configured by taking the design requirement of the structural strength as a constraint condition; The through holes are used for exhausting in the forming process of the aluminum pipe carbon-coated fiber composite structure; the through holes are filled with adhesive and solidified to form an anchoring structure, so that the connection strength of the interface bonding layer and the aluminum inner tube is enhanced; the aluminum inner tube is provided with a plurality of convex ribs, and the convex ribs are structural reinforcing ribs; the outer surface of the aluminum inner pipe is provided with a plurality of grooves which are used for guiding the adhesive in the forming process of the aluminum pipe carbon fiber composite structure; And the grooves are filled with adhesive and solidified to form an anchoring structure, so that the connection strength of the interface bonding layer and the aluminum inner tube is enhanced.
  8. 8. The unmanned aerial vehicle horn of claim 7, wherein: The through holes and the curing adhesive in the through holes provide longitudinal mechanical locking, and the grooves and the curing adhesive in the through holes provide transverse engagement reinforcement; the through holes are longitudinally arranged into a plurality of rows along the length of the aluminum inner pipe, and the intervals among the rows are the same in radian; one groove is defined by two longitudinal ribs which are symmetrically distributed.
  9. 9. The manufacturing method of the unmanned aerial vehicle arm comprises the steps of forming an aluminum tube carbon-coated fiber composite structure, and comprises the following steps: step S1, manufacturing an aluminum inner tube, which comprises the steps of preparing an aluminum tube and preprocessing the aluminum tube; S2, manufacturing an intermediate interface bonding layer, namely coating an adhesive or paving an adhesive film on the outer surface of the aluminum pipe; S3, manufacturing a carbon fiber outer layer, namely wrapping carbon fibers on the outer wall of the aluminum pipe by adopting a winding or layering process; And S4, curing and forming, namely curing the component coated in the step S3 by adopting an autoclave or vacuum bag pressing process to obtain an aluminum tube carbon fiber-coated composite structure, wherein the aluminum tube carbon fiber-coated composite structure is used as the unmanned aerial vehicle arm of any one of claims 1-8.
  10. 10. The method of manufacturing as claimed in claim 9, wherein: S5, machining a connecting interface at two ends of the horn; In step S1, the pretreatment includes surface treatment of the aluminum pipe to increase the surface roughness; in the step S1, a plurality of through holes are formed in the pipe wall of the aluminum pipe through integral molding or machining, and a plurality of grooves are formed in the outer wall of the aluminum pipe; in the step S2, a plurality of through holes and a plurality of grooves of the aluminum pipe are filled with adhesive, and the anchoring structure of the interface bonding layer and the aluminum inner pipe is formed after the adhesive is solidified in the step S4; in the step S3, winding or layering is carried out by adopting carbon fiber prepreg, the winding tension is controlled to be 20-50N, air bubbles are removed by rolling in the layering process, and the air is discharged from a plurality of through holes of the aluminum pipe; in the step S4, the curing temperature is determined according to the binder system, the range is 120-180 ℃, and the heat preservation time is 1.5-4 hours.
  11. 11. The unmanned aerial vehicle horn assembly is characterized by comprising the unmanned aerial vehicle horn according to any one of claims 1-8 and a motor arranged at one end of the horn, wherein a propeller is arranged on the motor.

Description

Unmanned aerial vehicle horn, manufacturing method and horn assembly Technical Field The application relates to the technical field of unmanned aerial vehicle structures, in particular to an unmanned aerial vehicle horn, a manufacturing method and a horn assembly. Background The unmanned aerial vehicle horn is as connecting fuselage and driving system's key bearing part, and its structural property directly influences unmanned aerial vehicle's flight performance, duration and load capacity. At present, the unmanned aerial vehicle horn mainly adopts the following structural forms: 1) The pure aluminum alloy horn is formed by processing aluminum alloy pipes or profiles, has the advantages of convenient processing and lower cost, but has the defects of larger weight and insufficient specific strength, and is difficult to meet the requirements of long-endurance unmanned aerial vehicles; 2) The pure carbon fiber arm is rolled or pultruded by adopting carbon fiber prepreg, has the advantages of light weight and high specific strength, but has the obvious defects of high cost, high raw materials and processing cost of the carbon fiber, poor shock resistance, easy brittle fracture, difficult connection, complicated cementing or pre-embedded metal piece process for connection with metal pieces, poor maintainability and difficult repair of local damage; 3) The carbon fiber-coated foam core material structure has the advantages that the carbon fiber shell is adopted to coat the foam core material, the weight is further reduced, but the structural strength is insufficient, the larger bending moment and torque are difficult to bear, and the bonding strength of the interface between the foam core material and the carbon fiber is limited. The technical scheme is difficult to simultaneously meet the comprehensive requirements of the unmanned aerial vehicle arm on light weight, high strength, low cost, easy connection and maintainability. Particularly, under the current strong competition background of the unmanned aerial vehicle industry, how to effectively reduce the cost and the weight on the premise of ensuring the structural performance becomes a technical problem to be solved urgently. Disclosure of Invention The application aims to solve the technical problem of providing the unmanned aerial vehicle arm, and solves the problem of effective cost and weight reduction of the unmanned aerial vehicle arm on the premise of ensuring structural performance. The application also provides a manufacturing method of the unmanned aerial vehicle horn, and mass production with simple process and controllable cost is realized. In order to solve the technical problems, the application adopts the following technical scheme: The unmanned aerial vehicle arm is used for connecting an unmanned aerial vehicle body and a motor, is of an aluminum tube carbon fiber-coated composite structure and comprises an aluminum inner tube, a carbon fiber outer layer and an interface bonding layer, wherein the aluminum inner tube is used as a bearing framework to provide main bending rigidity and compressive strength and is used as a mounting base connected with the unmanned aerial vehicle body and the motor, the carbon fiber outer layer is coated on the outer surface of the aluminum inner tube and is used as a reinforcing layer to provide circumferential constraint and torsional rigidity, and the interface bonding layer is of an adhesive structure formed by solidifying an adhesive and used for providing reliable connection and load transfer between the aluminum inner tube and the carbon fiber. In some embodiments, the aluminum inner tube has an outer surface with a surface roughness Ra of 1.6-6.3 μm to enhance the adhesive strength with the carbon fiber outer layer, and the outer surface of the aluminum inner tube has a predetermined roughness by a surface treatment including an anodic oxidation treatment or a sand blast treatment. In some embodiments, the carbon fiber prepreg is used for winding or layering, so that the carbon fiber outer layer is coated on the outer surface of the aluminum inner tube, and the fiber volume content in the carbon fiber outer layer is 55% -65%. In some embodiments, the carbon fiber outer layer has a fiber ply angle of one or more of 0 DEG, -45 DEG, and-90 DEG, and the carbon fiber employed in the carbon fiber outer layer has a tensile modulus of 230-250GPa and/or a tensile strength of 3500-5000MPa. In some embodiments, the wall thickness of the aluminum inner tube is 1.5-3 times the thickness of the carbon fiber outer layer, and the ratio of the outer diameter of the aluminum inner tube to the total outer diameter of the horn is 0.6-0.8 to ensure the weight and rigidity of the horn. In some embodiments, the two ends of the horn are respectively provided with a connecting interface, wherein one end is a machine body connecting end, the connecting interface is integrally processed or welded by adopting an aluminum alloy fla