An unmanned aerial vehicle airborne weighing device

Abstract

The utility model relates to a kind of unmanned aerial vehicle aerial weighing device, including connecting element and the load-bearing element located below connecting element, and the weighing mechanism is arranged in the circumferential array between adjacent connecting element and load-bearing element;The weighing mechanism includes: load-bearing support seat, circumferentially arrayed below the connecting element;Measurement component, along horizontally deformable is arranged in the load-bearing support seat one side, for measuring object mass;And swing lever component, swingably set on the load-bearing support seat, and one end extrusion on the surface of the measurement component.The utility model is distributed in circumferential array by 3 weighing mechanisms, and the weight of heavy object is evenly dispersed to each measurement component, to avoid single-point stress deviation;Meanwhile, the first, second swing arm arranged in parallel ensure stable force transmission, reduce the error caused by structural sway.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) equipment technology, and in particular to an aerial weighing device for measuring the aerial load mass of UAVs. Background Technology

[0002] With the rapid development of drone technology, its application in fields such as material transportation, aerial surveying and mapping, and emergency rescue is becoming increasingly widespread. In drone material transportation scenarios, it is necessary to measure the mass of the load in real time to avoid overloading, which would reduce the drone's endurance and operational stability, or insufficient load, which would affect transportation efficiency. At the same time, some special scenarios also require real-time measurement of the weight of the load in the air.

[0003] However, existing drone weighing devices often have the following drawbacks:

[0004] 1) Most devices adopt a single-point weighing structure, where the weight of the object is concentrated at a single measurement point. This makes the measuring components susceptible to force shift due to bumps and tilting during the drone's flight, resulting in significant errors.

[0005] 2) The measuring components are mostly fixed welded or integrated designs. When the sensor fails or needs to be calibrated, the entire weighing structure needs to be disassembled, which is complicated and time-consuming.

[0006] 3) In some devices, the force transmission components adopt a sliding contact method. With long-term use, gaps are easily generated due to wear, or the force transmission becomes discontinuous due to frictional resistance, which further reduces the measurement accuracy.

[0007] To address the aforementioned issues, there is an urgent need to design an aerial weighing device for UAVs that features uniform force distribution, convenient assembly and disassembly, and low friction interference, in order to meet the high precision and high stability requirements of aerial weighing for UAVs. Summary of the Invention

[0008] The purpose of this invention is to provide an aerial weighing device for measuring the aerial load mass of unmanned aerial vehicles (UAVs). It aims to solve the technical problems of existing UAV weighing devices, such as uneven force distribution, low measurement accuracy, inconvenient installation and maintenance, and significant frictional interference.

[0009] To achieve the above technical solution, the technical solution of this utility model is as follows: An aerial weighing device for unmanned aerial vehicles (UAVs) includes a connecting element and a supporting element located below the connecting element, with a weighing mechanism arranged in a circumferential array between adjacent connecting elements and the supporting element; the weighing mechanism includes:

[0010] A support base, arranged in a circular array below the connecting element;

[0011] A measuring component, horizontally deformable and mounted on one side of the support base, is used to measure the mass of an object; and

[0012] The pendulum assembly is swayably mounted on the bearing support base, with one end pressed against the surface of the measuring assembly;

[0013] Wherein: when the pendulum assembly is subjected to a heavy object, the pressing element on the pendulum assembly will press the measuring component downward in the vertical direction to deform it.

[0014] Furthermore, the support base has an outward extension arm on one side; one end of the extension arm has a horizontal mounting platform; one end of the measuring component is detachably mounted on the mounting platform; the bottom of the support base extends outward to form a swing seat; one end of the swing rod assembly is hinged to the swing seat.

[0015] Furthermore, the measuring component is a strain gauge sensor; one end of the strain gauge sensor is detachably mounted with a convex extrusion seat; the convex extrusion seat is tumbledly connected to the extrusion element of the rocker arm assembly.

[0016] Furthermore, the pendulum assembly includes a pendulum base; a first pendulum arm and a second pendulum arm are oscillatingly mounted on the pendulum base; the other ends of the first pendulum arm and the second pendulum arm are hinged to the pendulum base; a pressing component is provided at one end of the first pendulum arm; the pressing component can be swung and hung above the measuring component.

[0017] Furthermore, the first swing arm and the second swing arm are arranged parallel to each other;

[0018] The extrusion assembly is rotatably equipped with an extrusion element.

[0019] Furthermore, the extrusion element is a bearing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) This utility model uses three weighing mechanisms arranged in a circular array to evenly distribute the weight of the object to each measuring component, avoiding single-point force deviation; at the same time, the parallel arrangement of the first and second swing arms ensures stable force transmission and reduces errors caused by structural swaying.

[0022] 2) This utility model uses a bearing and a convex extrusion seat to roll together the extrusion element, which greatly reduces the frictional resistance in the force transmission process, avoids gap errors caused by wear, and ensures measurement stability during long-term use;

[0023] 3) This utility model adopts a detachable connection between the measuring component (strain gauge sensor), the mounting platform, and the convex extrusion seat. When the sensor needs to be calibrated or replaced, it is not necessary to disassemble the entire weighing structure. Only the corresponding bolts need to be loosened to operate, which reduces the difficulty and cost of maintenance.

[0024] 4) The load-bearing support base, swing arm and other components of this utility model are made of aluminum alloy or stainless steel, which achieves lightweight while ensuring strength. It can be adapted to different models of small and medium-sized drones (load weight 5-50kg) and has a wide range of applications. Attached Figure Description

[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0026] Figure 1 A 3D diagram of an aerial weighing device for a drone;

[0027] Figure 2 A front view of an aerial weighing device for drones installed on a drone. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please see the appendix Figure 1 and Figure 2 As shown: An aerial weighing device for unmanned aerial vehicles includes a connecting element 1, a bearing element 2, and a weighing mechanism 3, wherein:

[0031] The connecting element 1 is used for detachable connection with the drone body. Its structure is a circular flange with 4-6 mounting holes evenly distributed on the flange. It is fixed to the mounting interface at the bottom of the drone body by bolts to achieve a stable connection between the weighing device and the drone. The lower surface of the flange has an annular protrusion for initial positioning with the bearing element 2 to avoid radial offset.

[0032] The load-bearing element 2 is used to carry the heavy object to be weighed. Its structure is a triangular tray or a square frame adapted according to the type of load. The upper surface of the tray / frame is provided with an anti-slip rubber pad to prevent the heavy object from sliding. The upper surface is fixedly connected to the swing arm assembly 33 of the weighing mechanism 3.

[0033] Weighing mechanisms 3 are arranged in a uniform array along the circumferential direction between the connecting element 1 and the bearing element 2, with a quantity of 3-4, preferably 3, distributed at a 120° angle to satisfy mechanical balance. Each weighing mechanism 3 independently realizes the transmission and measurement of force, and the measurement accuracy is further improved by summarizing multiple sets of data.

[0034] Based on the above embodiments, each weighing mechanism 3 includes a support base 31, a measuring component 32, and a swing arm assembly 33, wherein:

[0035] The bearing support 31 is made of aluminum alloy in one piece, which is lightweight and has high strength. It has an "L" shaped structure. The top of its vertical section is detachably fixed to the lower surface of the connecting element 1 by bolts, which facilitates the overall assembly and disassembly.

[0036] The extension arm 311 extends horizontally outward from one side of the horizontal section of the bearing support 31, with a length of 5-8cm. The extension direction is perpendicular to the radial direction of the connecting element 1, ensuring that the installation position of the measuring component 32 matches the force transmission path of the swing arm assembly 33.

[0037] Mounting platform 312 is located at the free end of extension arm 311, protruding horizontally with a height of 2-3cm. Mounting platform 312 has 2-4 threaded holes with diameters of M4-M6 for detachable installation of measuring component 32.

[0038] The swing base 313 extends outward from the bottom of the horizontal section of the support base 31, with the extension direction consistent with the extension arm 311. It has a "U"-shaped fork structure. The two side plates of the fork structure are symmetrically provided with pin holes with a diameter of 8-10mm, which are used to connect the swing rod assembly 33 through a hinge.

[0039] The measuring component 32 uses a high-precision strain gauge sensor, preferably model BX120-3AA, with a sensitivity of 1.9-2.1mV / V and a range of 0-50kg. The sensor body is a cuboid structure with a length of 10-15cm, a width of 3-5cm, and a thickness of 1-2cm. One end is fixed and detachably connected to the threaded hole of the mounting platform 312 by a screw, with the screw model matching the threaded hole. The other end is free and can deform in the horizontal direction.

[0040] The convex extrusion seat 321 is detachably mounted on the upper surface of the free end of the strain gauge sensor by two internal hex bolts. Its structure is a "hemispherical protrusion" with a protrusion height of 3-5mm and a spherical radius of 5-8mm. It is made of wear-resistant steel to avoid long-term extrusion wear. The spherical surface of the convex extrusion seat 321 is used for rolling contact with the extrusion element of the swing arm assembly 33 to reduce frictional resistance.

[0041] The pendulum base 331 in the pendulum assembly 33 is a rectangular metal block with a length of 8-12cm, a width of 5-7cm, and a thickness of 2-3cm. Its lower surface is fixed to the upper surface of the bearing element 2 by bolts. The bolts pass through the pendulum base and the bearing element to ensure lossless force transmission. The first pendulum arm 332 and the second pendulum arm 333 are both long bars made of stainless steel with a length of 15-20cm, a width of 2-3cm, and a thickness of 1-1.5cm. They are set parallel to each other with a spacing of 3-5cm, and each has a through hole at one hinge end that matches the pin hole of the pendulum base 313. A stainless steel pin with a diameter that matches the pin hole passes through the pin hole of the pendulum base 313 and the through holes of the first and second pendulum arms to realize the hinge connection between the pendulum assembly 33 and the bearing support 31. The pendulum arm can swing freely in the vertical direction around the pin, with a swing angle range of 0-30°.

[0042] The extrusion assembly 334 is fixedly installed on the side of the first swing arm 332 away from the hinge end and close to the measuring assembly 32. Its structure is a "U" shaped bracket made of the same material as the swing arm. The two side plates of the bracket are symmetrically opened with shaft holes with a diameter of 6-8mm.

[0043] The extrusion element uses a deep groove ball bearing, preferably model 6203, with an inner diameter of 17mm, an outer diameter of 40mm, and a width of 12mm. A bearing shaft passes through the shaft hole of the extrusion assembly 334 and the inner ring of the bearing, allowing the bearing to be rotatably mounted in a U-shaped bracket. The outer surface of the bearing's outer ring is in close contact with the spherical surface of the convex extrusion seat 321 and can roll along the spherical surface, ensuring that when the rocker arm assembly 33 is under force, the extrusion element can transmit pressure to the measuring assembly 32 without friction.

[0044] In use, when the object to be weighed is placed on the bearing element 2, the weight of the object is transmitted to the pendulum base 331 of the pendulum arm assembly 33 through the bearing element 2. After the pendulum base 331 is subjected to force, it drives the first pendulum arm 332 and the second pendulum arm 333 to swing downward in the vertical direction around the pin of the pendulum seat 313. At this time, the extrusion component 334 on the first pendulum arm 332 moves down synchronously with the pendulum arm, causing the outer ring of the extrusion element bearing to roll along the spherical surface of the convex extrusion seat 321 and apply horizontal extrusion force to the strain gauge sensor. Under the extrusion force, the strain gauge sensor undergoes horizontal deformation, and the resistance value of its internal strain gauge changes with the degree of deformation. The resistance change signal is transmitted to the UAV control system through the wire. The control system converts the resistance signal into the mass of the object according to the preset calibration algorithm, such as the multi-sensor data fusion algorithm, to complete the aerial weighing. When the sensor accuracy decreases, the screws of the mounting platform 312 can be loosened, and the sensor can be removed for calibration or replacement without disassembling other parts.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art should be able to make equivalent embodiments by making some changes or modifications to the above-disclosed technical content without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An aerial weighing device for unmanned aerial vehicles (UAVs), comprising a connecting element (1) and a load-bearing element (2) located below the connecting element (1), characterized in that, A weighing mechanism (3) is arranged in a circumferential array between adjacent connecting elements (1) and bearing elements (2); the weighing mechanism (3) includes: A support base (31) is arranged in a circular array below the connecting element (1); A measuring component (32), horizontally deformable and disposed on one side of the bearing support (31), is used to measure the mass of an object; and The swing arm assembly (33) is swingably mounted on the bearing support base (31), and one end is pressed against the surface of the measuring assembly (32); When the swing arm assembly (33) is subjected to a heavy object, the extrusion element on the swing arm assembly (33) is driven to extrude the measuring assembly (32) vertically downward, causing it to deform.

2. The UAV aerial weighing device as described in claim 1, characterized in that: The bearing support base (31) has an extension arm (311) extending outward on one side; one end of the extension arm (311) has a mounting platform (312) horizontally; one end of the measuring component (32) is detachably mounted on the mounting platform (312); the bottom of the bearing support base (31) extends outward to provide a swing seat (313); one end of the swing rod assembly (33) is hinged to the swing seat (313).

3. The UAV aerial weighing device as described in claim 2, characterized in that: The measuring component (32) is a strain gauge sensor; a convex extrusion seat (321) is detachably installed at one end of the strain gauge sensor; the convex extrusion seat (321) is tumbledly connected to the extrusion element of the swing arm assembly (33).

4. The UAV aerial weighing device as described in claim 2, characterized in that: The swing arm assembly (33) includes a swing base (331); a first swing arm (332) and a second swing arm (333) are oscillatingly mounted on the swing base (331); the other ends of the first swing arm (332) and the second swing arm (333) are hinged to a swing seat (313); a pressing component (334) is provided at one end of the first swing arm (332); the pressing component (334) can be swung and hung above the measuring component (32).

5. The UAV aerial weighing device as described in claim 4, characterized in that: The first swing arm (332) and the second swing arm (333) are arranged in parallel; The extrusion assembly (334) is rotatably provided with an extrusion element.

6. The UAV aerial weighing device as described in claim 4, characterized in that: The extrusion element is a bearing.

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