Anti-interference shielding device for airborne acoustic sensor of unmanned aerial vehicle

Abstract

The utility model discloses an unmanned aerial vehicle airborne acoustic sensor anti-interference shielding device which comprises a sensor support and a shielding cover, the top of the sensor support is provided with an upper connecting plate used for being connected with the bottom of an unmanned aerial vehicle, the lower end of the upper connecting plate is provided with a vibration reduction support, and a flexible spring is arranged in the vibration reduction support. The bottom of the flexible spring is provided with a connected lower connecting plate, the shielding cover is composed of a metal cover located on the inner layer and an insulating cover located on the outer layer in a double-layer mode, the bottom of the shielding cover is not closed and is provided with a detection output port, a sensor induction area is not affected by the shielding cover, and the detection output port is used for installing a sensor. The utility model belongs to the technical field of unmanned aerial vehicle maintenance and monitoring, and particularly provides an anti-interference shielding device for an airborne acoustic sensor of an unmanned aerial vehicle, which is used for reducing the influence of vibration generated by flight on the sensor and overcoming the requirements on the shielding device and materials thereof and the problem that a single electromagnetic shielding cover cannot effectively block electromagnetic interference.

Description

Technical Field

[0001] The utility model belongs to the technical field of UAV maintenance and monitoring, and specifically refers to an anti-interference shielding device for an airborne acoustic sensor of a UAV. Background Technique

[0002] In the power system, UAVs have been widely used in inspection operations, fault troubleshooting, emergency rescue, planning and design. UAVs can quickly and efficiently inspect overhead transmission lines. It can take close-up photos of equipment such as towers, conductors, and insulators of the line to detect whether there are defects such as broken strands, loose strands, wear, and corrosion. For example, important fittings such as line clamps and bolts on the transmission line will have varying degrees of loosening problems due to the influence of field environmental factors. In daily inspection work, UAVs can quickly and efficiently inspect overhead transmission lines. And through a high-definition camera, it can clearly observe whether there are cracks, damages, or dirt accumulation on the surface of the insulator, and timely discover potential fault hazards.

[0003] When existing UAVs are used as inspection equipment, the following problems exist:

[0004] 1. The UAV will generate vibrations during flight, and this vibration will have an adverse effect on various sensors, cameras and other equipment mounted on it, reducing the accuracy and reliability of the equipment. For example, vibrations may cause problems such as blurred images and inaccurate measurement data. At the same time, vibrations will introduce additional noise into the output signal of the sensor, increasing the difficulty of data processing.

[0005] Currently, although there are some vibration reduction measures, the effect is limited and the interference caused by vibrations cannot be completely eliminated.

[0006] 2. There is a strong electromagnetic field in the power system, especially in areas such as high-voltage transmission lines and substations. UAVs will be affected by electromagnetic interference in an operating environment with a strong electromagnetic field, resulting in signal distortion of the sensor output. Electromagnetic interference will also reduce the measurement accuracy of the sensor. Currently, through a shielding cover made of metal material, the external interference environment is shielded to protect the measuring point to work in a stable environment and ensure production safety.

[0007] However, in practical applications, the shielding effect of the existing technology is limited. For electromagnetic interference in specific frequency bands, it may not be able to completely block it, resulting in the acoustic sensor still being affected to a certain extent. The environmental adaptability is poor. Under different environmental conditions, such as changes in temperature, humidity, and air pressure, the shielding performance may fluctuate; the weight and volume are relatively large. The heavier shielding device will increase the load of the drone, affecting the flight performance and endurance time of the drone. The larger-sized shielding device may occupy valuable space on the drone, affecting the installation and layout of other devices; the installation and maintenance are complex, and the material cost is relatively high. Some shielding devices will also cause a certain attenuation effect on the signal of the acoustic sensor. Different models of acoustic sensors may require different shielding devices, which may lead to compatibility problems. In a high-temperature working environment, a shielding device with poor heat dissipation performance will also damage the sensor. Summary of the Invention

[0008] In view of the above situation, to overcome the defects of the existing technology, the present utility model provides an anti-interference shielding device for an airborne acoustic sensor of a drone, which is used to reduce the influence of vibration generated during flight on the sensor, overcome the requirements for the shielding device and its materials, and the problem that a single electromagnetic shielding cover cannot effectively block electromagnetic interference.

[0009] The technical solutions adopted in this application are as follows:

[0010] This solution provides an anti-interference shielding device for an airborne acoustic sensor of a drone, which is composed of a sensor bracket connected to the bottom of the drone and a shielding cover located at the bottom of the sensor bracket. The shielding cover is used to install the sensor;

[0011] The top of the sensor bracket is provided with an upper connecting plate for connecting to the bottom of the drone. A damping bracket is arranged at the lower end of the upper connecting plate. A flexible spring is arranged inside the damping bracket, and a lower connecting plate is connected to the bottom of the flexible spring;

[0012] The shielding cover is arranged in a double-layer structure and is located at the bottom of the lower connecting plate. The shielding cover is composed of a metal cover located inside and an insulating cover located outside. The bottom of the shielding cover is not closed and is provided with a detection output port, so that the sensing area of the sensor is not affected by the shielding cover. The detection output port is used to install the sensor, and the sensor signal is emitted from the bottom to detect the target to be measured.

[0013] As a preferred solution, a fixture fixing plate is connected below the lower connecting plate, and a fixture is installed below the fixture fixing plate to improve the accuracy of detection data and the convenience of detection work. A rotating block driven by a motor is arranged at the end of the fixture, and mounting holes matching the rotating block are opened on both sides of the insulating cover.

[0014] In a further embodiment, symmetrical louvers are provided on opposite sides of the metal cover, and ventilation holes arranged in an array are provided on opposite sides of the insulating cover to solve the problem of sensor overheating. The louvers and the ventilation holes are arranged on the same side.

[0015] Furthermore, an inner fixing plate and an outer fixing plate are provided at the bottom opening of the shielding cover to close the detection output port. A bolt connection is provided between the top of the metal cover and the insulating cover. The outer fixing plate is connected to the bottom of the insulating cover by bolts. The inner fixing plate is arranged in the inner hollow part of the outer fixing plate and is connected to the bottom of the metal cover by bolts. A connecting piece is fixed between the inner fixing plate and the outer fixing plate. Four groups of connecting pieces are arranged in a cross shape, and the sensor is installed on the inner fixing plate.

[0016] In a further embodiment, acoustic array holes and optical array holes for facilitating the detection of the sensor probe are provided on the inner fixing plate. The hole positions are not subject to special restrictions and can be adjusted according to the actual requirements of the acoustic and optical sensors. Since the inner fixing plate is in contact with the sensor, a flexible material can be used, and the inner fixing plate can be replaced according to different sensor detection holes.

[0017] The beneficial effects achieved by the present utility model with the above structure are as follows:

[0018] 1. Through the setting of the double-layer shielding cover, the influence of electromagnetic interference on the UAV is reduced, providing a stable and safe working environment for the sensor, improving the accuracy of monitoring sensor data collection, thereby reducing maintenance costs and enhancing the reliability and safety of the power transmission system.

[0019] 2. Through the sensor bracket, a shock-absorbing structure is set to reduce the influence of vibration generated by the UAV-mounted sensor. The design of the fixture rotating block can improve the efficiency of the detection work.

[0020] 3. The hole and slot structure is optimized to enhance the stability and safety of the sensor operation. By providing air holes on the double-layer shielding cover and opening a detection output port at the bottom, the working efficiency of the sensor is effectively improved, providing convenience for the installation and operation of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure provided by this solution;

[0022] Figure 2 is a front view of the combined state of the shock-absorbing bracket and the shielding cover in this solution;

[0023] Figure 3 is a side view of the combined state of the shock-absorbing bracket and the shielding cover in this solution;

[0024] Figure 4A cross-sectional view of the double-layer shield provided by this solution;

[0025] Figure 5 A bottom view of the double-layer shield provided by this solution.

[0026] The meanings of the reference numerals in the drawings are as follows:

[0027] 1. Bolt, 2. Insulating cover, 3. Metal cover, 4. Mounting hole, 5. Louver, 6. Bolt, 7. Bolt, 8. Acoustic array hole, 9. Optical array hole, 10. Bolt, 11. Connecting piece, 12. Bolt, 13. Inner fixing plate, 14. Outer fixing plate, 15. Drone, 16. Fixture, 17. Ventilation hole, 18. Shield, 19. Sensor bracket, 20. Flexible spring, 21. Fixture fixing plate, 22. Rotating block, 23. Upper connecting plate, 24. Lower connecting plate, 25. Vibration damping bracket. Specific implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Embodiment 1

[0029] Please refer to Figure 1 As shown, this embodiment provides an anti-interference shielding device for an airborne acoustic sensor of a drone, which includes a sensor bracket 19 connected to the bottom of the drone 15 and a shield 18 located at the bottom of the sensor bracket 19. The shield 18 is used to mount the sensor.

[0030] Refer to Figure 2 and Figure 3 As shown, the sensor bracket 19 is an important structure for mounting the sensor on the drone. A upper connecting plate 23 connected to the bottom of the drone is provided at the top of the sensor bracket 19. A vibration damping bracket 25 is provided at the lower end of the upper connecting plate 23. A flexible spring 20 is provided inside the vibration damping bracket 25. The flexible spring 20 is connected to the lower connecting plate 24. To improve the accuracy of the detection data and the convenience of the detection work, a fixture 16 is installed below the lower connecting plate 24. The end of the fixture 16 is a rotating block 22 driven by a motor.

[0031] Refer to Figure 2 , Figure 4 and Figure 5 As shown, the shield 18 is provided in a double-layer structure and is located at the bottom of the lower connecting plate. The shield 18 is composed of a metal cover 3 located in the inner layer and an insulating cover 2 located in the outer layer. The double-layer shield 18 is designed to isolate the influence of the vibration during the flight of the drone 15 and environmental factors on the sensor, so that the sensing area of the sensor is not affected by the shield. A detection output port is designed at the bottom. The detection output port is used to mount the sensor. The sensor signal is emitted from the bottom to detect the target to be measured.

[0032] For the convenience of installation, the bottoms of the metal cover 3 and the insulating cover 2 are not closed, and their bottoms are connected to the outer fixing plate 14 through various bolts. A detection output port for facilitating the installation of the sensor is provided in the middle of the outer fixing plate 14. When the sensor is installed inside the shielding cover 18, there is an inner fixing plate 13 for closing the detection output port. An acoustic array hole 8 and an optical array hole 9 for facilitating the detection of the sensor probe are provided on the inner fixing plate 13. As Figure 5 shown, connecting pieces 11 are respectively installed on the four sides of the inner fixing plate 13. Among them, the inner fixing plate 13 can be made of a flexible material because it contacts the sensor, and the inner fixing plate 13 can be replaced according to different sensor detection holes.

[0033] As a preferred embodiment, the positions of the acoustic array hole 8 and the optical array hole 9 can be adjusted according to actual detection requirements, and there are no special restrictions on the hole positions on the inner fixing plate 13, which can be adjusted according to the actual requirements of the acoustic and optical sensors.

[0034] As Figure 4 shown, considering the problem of sensor heating, symmetrical louvers 5 are provided on the front and back sides of the metal cover 3, and ventilation holes 17 arranged in an array are opened on the front and back sides of the insulating cover 2.

[0035] The specific installation steps of the device are as follows:

[0036] Step S1: First, when assembling the double-layer shielding cover, the metal cover 3 can be first placed inside the insulating cover 2 and positioned using the bolt 1, where the louver 5 of the metal cover 3 is on the same side as the ventilation hole 17 of the insulating cover 2.

[0037] Step S2: Subsequently, connect the outer fixing plate 14 to the bottom of the double-layer shielding cover through the bolt 12 and the bolt 7.

[0038] Step S3: Then, install the sensor on the inner fixing plate 13, and then use the bolt 6 to install the connecting piece 11 on the outer fixing plate 14.

[0039] Step S4: Then, connect the shielding device to the sensor bracket 19 through the clamp 16.

[0040] Step S5: Finally, mount the device on the bottom of the drone.

[0041] After the detection work is completed, the horizontal position of the shielding cover can be adjusted by rotating the clamping block 22 to reduce the risk of the shielding cover 18 hitting the ground. After safely landing, just remove the device from the position connected to the bottom of the drone 15 and put it into the device protection box.

[0042] For sensors of different models, the internally fixed plate 13 adapted thereto can be replaced independently, and the detection hole positions on the internally fixed plate 13 can be made according to specific requirements.

[0043] In addition, the fixture rotating block 22 of the device can clamp the shielding device to make forward and backward flipping movements, which is convenient for detection.

[0044] In summary, an anti-interference shielding device for an airborne acoustic sensor of a drone provided in this embodiment can effectively reduce the influence of the flight vibration of the drone, and has strong anti-interference ability during detection, can significantly improve the accuracy of sensor data acquisition for monitoring the power transmission system, thereby reducing the maintenance cost and improving the reliability and safety of the power transmission system.

[0045] Finally, it should be noted that the above-mentioned embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

[0046] Although the embodiments of the present invention have been disclosed above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. An anti-interference shielding device for an acoustic sensor onboard a drone, comprising a sensor bracket (19) connected to the bottom of the drone (15) and a shielding cover (18) located at the bottom of the sensor bracket (19), wherein the shielding cover (18) is used to install the sensor, and is characterized in that: An upper connecting plate (23) is provided on the top of the sensor bracket (19) for connecting to the bottom of the drone (15); a vibration reduction bracket (25) is provided at the lower end of the upper connecting plate (23); a flexible spring (20) is provided inside the vibration reduction bracket (25); and a connected lower connecting plate (24) is provided at the bottom of the flexible spring (20); The shielding cover (18) is double-layered and is arranged at the bottom of the lower connecting plate (24). The shielding cover (18) is composed of a metal cover (3) located at an inner layer and an insulating cover (2) located at an outer layer. The bottom of the shielding cover (18) is not closed and is provided with a detection output port. The detection output port is used to install a sensor. The sensor signal is emitted from the bottom of the detection output port to detect a target.

2. The anti-interference shielding device for an acoustic sensor onboard a drone according to claim 1, characterized in that: A clamp (16) fixing plate is connected to the lower portion of the lower connecting plate (24), a clamp (16) is installed below the clamp (16) fixing plate, a rotating block (22) driven by a motor is provided at the end of the clamp (16), and mounting holes (4) matching the rotating block (22) are provided on both sides of the insulating cover (2).

3. The anti-interference shielding device for an acoustic sensor onboard a drone according to claim 2, characterized in that: An inner fixing plate (13) and an outer fixing plate (14) are provided at the bottom opening of the shielding cover (18) for closing the detection output port; a bolt (1) is provided between the metal cover (3) and the top of the insulating cover (2) for fixing; the outer fixing plate (14) is connected to the bottom of the insulating cover (2); the inner fixing plate (13) is provided in the inner hollow of the outer fixing plate (14); the inner fixing plate (13) is connected to the bottom of the metal cover (3); and the sensor is mounted on the inner fixing plate (13).

4. The anti-interference shielding device for an acoustic sensor onboard a drone according to claim 3, characterized in that: The inner fixing plate (13) is provided with acoustic array holes (8) and optical array holes (9) for facilitating detection by sensor probes.

5. The anti-interference shielding device for an acoustic sensor onboard a drone according to claim 4, characterized in that: The metal cover (3) has symmetrically arranged shutters (5) on two opposite sides, and the insulation cover (2) has array-arranged ventilation holes (17) on two opposite sides, with the shutters (5) and the ventilation holes (17) being arranged on the same side.

6. The anti-interference shielding device for an acoustic sensor onboard a drone according to claim 4, characterized in that: The inner fixing plate (13) is made of a flexible material, and a connecting piece (11) is provided between the inner fixing plate (13) and the outer fixing plate (14) for fixing and replacing the inner fixing plate (13).

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