A multi-rotor UAV test bench

Abstract

The present invention discloses a multi-rotor UAV test bench, which includes a base, a support rod, a mounting plate, an upper cover, a middle cover, a fixing block, a universal shaft, a universal joint, and a fixing bolt; the support rod is arranged on the base, the upper end of the support rod is fixedly connected to the universal joint, the lower end of the universal shaft is rotatably connected to the universal joint, the fixing bolt is threadedly connected to the universal joint, and its end extends into the universal joint and abuts against the lower end of the universal shaft; the fixing block is cylindrical, its lower end is threadedly connected to the upper end of the universal shaft, and the outer circumference of the fixing block has an external thread; the middle cover is in the shape of a circular lid, with the upper end blocked and the lower end open, and an internal thread is provided inside. A number of rectangular grooves are opened along the circumferential array direction on the outer edge of the upper end surface of the middle cover. The middle cover is sleeved on the fixing block. The beneficial effect of the present invention is that the present invention designs a threaded connection structure to replace the above-mentioned structure of the bolt, nut and universal plate, which can install and disassemble in a very short time and improve the work efficiency of disassembly and assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of unmanned aerial vehicle accessory equipment, and in particular relates to a multi-rotor unmanned aerial vehicle test bench. Background Art

[0002] In recent years, multi-rotor drones have been widely used in military and civilian fields. Multi-rotor drones have the flight performance of hovering in the air, low altitude and low speed, and constant heading. They are drones that can perform tasks under various complex working conditions. Multi-rotor drones have six degrees of freedom, linear motion along the three axes of the body coordinate system, and rotational motion around the three axes of the body coordinate system. At present, domestic scholars have conducted a lot of research on the control algorithm of multi-rotor drones, so the simulation and experiment of the control algorithm are particularly important. With the in-depth study of multi-rotor drones, new control algorithms will continue to be proposed. When the new multi-rotor drone algorithm is in the debugging stage, actual experimental verification is required. Since the new control algorithm may cause unstable flight when applied to multi-rotor drones, it is necessary to fix the multi-rotor drone on the test bench to test the working status. Since the control algorithm is constantly updated and debugged, it is necessary to repeatedly install and disassemble the multi-rotor drone on the test bench during one debugging process.

[0003] The existing test bench currently uses four sets of screws and nuts to fix the drone on the universal plate. The installation and disassembly work requires the continuous installation and disassembly of four or more bolts and nuts. The whole process wastes a lot of experimental time, so the efficiency of the experiment cannot be guaranteed. Summary of the invention

[0004] Aiming at the problem that disassembly and assembly take a long time in the prior art, a multi-rotor UAV test bench is provided.

[0005] A multi-rotor UAV test bench comprises a base, a support rod, a mounting plate, an upper cover, a middle cover, a fixing block, a universal shaft, a universal joint, and fixing bolts;

[0006] The support rod is arranged on the base, the upper end of the support rod is fixedly connected to the universal joint, the lower end of the universal shaft is rotatably connected to the universal joint, the fixing bolt is threadedly connected to the universal joint, and the end thereof extends into the interior of the universal joint and presses against the lower end of the universal shaft;

[0007] The fixing block is cylindrical, the lower end of which is threadedly connected to the upper end of the universal shaft, and the outer circumference of the fixing block has external threads;

[0008] The middle cover is in the shape of a circular lid, with a sealed upper end and an open lower end. An internal thread is provided inside the middle cover, and a plurality of rectangular grooves are provided on the outer surface of the upper end surface along the circumferential array direction. The middle cover is sleeved on the fixed block and connected by threads.

[0009] The upper cover is in the shape of a circular lid, sealed at the upper end and open at the lower end. Inside the upper end face, several rectangular protrusions are formed by protruding outward along the circumferential array direction. A through hole is opened at the upper end. The upper cover is sleeved on the middle cover, and a retaining ring is installed at the lower end position of the upper cover;

[0010] The mounting plate is fixedly arranged on the upper end face of the upper cover. A compression spring is arranged in the through hole of the upper cover. The upper end of the compression spring presses against the mounting plate, and the lower end presses against the upper end face of the middle cover.

[0011] Among them, for the multi-rotor UAV test bench,

[0012] On the outer side of the upper end face of the middle cover, several convex first ramp segments are arranged along the circumferential array direction, and the height increases in the counterclockwise direction;

[0013] Inside the upper end face of the upper cover, several second ramp segments are formed by protruding outward along the circumferential array direction, and the direction of increasing height is opposite to that of the first ramp segment.

[0014] Among them, for the multi-rotor UAV test bench, the support rod is inserted into the sleeve and can slide up and down in the sleeve,

[0015] The lower end of the sleeve is fixedly connected to the base, and the fastening screw is threadedly connected to the sleeve, and its end presses against the support rod.

[0016] Advantages of the present invention:

[0017] The present invention designs a threaded connection structure to replace the above-mentioned structure of the bolt, nut and universal plate, which can carry out the installation and disassembly work in a very short time and improve the work efficiency of disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of an embodiment of the present invention;

[0019] Figure 2 is Figure 1 a perspective view after removing the UAV;

[0020] Figure 3 is a schematic diagram of the upper cover of an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the middle cover of an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the middle cover of an embodiment of the present invention;

[0023] Figure 6 is a cross-sectional view of an embodiment of the present invention;

[0024] Figure 7 is a cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings rather than all of them.

[0026] See Figures 1 - 7 , this embodiment provides a multi-rotor drone test bench.

[0027] It includes a base 10, a support rod 11, a mounting plate 2, an upper cover 3, a middle cover 4, a fixing block 5, a universal shaft 6, a universal joint 7, and a fixing bolt 8.

[0028] The support rod 11 is arranged on the base 10. The upper end of the support rod 11 is fixedly connected to the universal joint 7. The lower end of the universal shaft 6 is rotatably connected to the universal joint 7. The fixing bolt 8 is threadedly connected to the universal joint 7, and its end extends into the universal joint 7 and abuts against the lower end of the universal shaft 6.

[0029] The fixing block 5 is cylindrical, and its lower end is threadedly connected to the upper end of the universal shaft 6. The outer circumference of the fixing block 5 has an external thread.

[0030] As Figure 4 , 5 shown, the middle cover 4 is in the shape of a circular lid, with the upper end sealed and the lower end open. An internal thread 42 is provided inside. Along the circumferential array direction on the outer upper edge of the upper end face, several rectangular grooves 41 are opened. The middle cover 4 is sleeved on the fixing block 5 and is connected by threads. On the outer upper edge of the upper end face of the middle cover 4, several raised first ramp segments 43 are arranged along the circumferential array direction, and the height increases in the counterclockwise direction.

[0031] As Figure 3 shown, the upper cover 3 is in the shape of a circular lid, with the upper end sealed and the lower end open. Along the circumferential array direction on the inner upper end face, several rectangular protrusions 31 protrude outward. A through hole 33 is opened at the upper end. The upper cover 3 is sleeved on the middle cover 4, and a retaining ring 35 is installed at the lower end position of the upper cover 3. There is a certain gap between the upper cover 3 and the middle cover 4, and they can freely rotate and move up and down relative to each other. The retaining ring 35 blocks the middle cover 4 to prevent the middle cover 4 from falling off the upper cover 3.

[0032] Along the circumferential array direction on the inner upper end face of the upper cover 3, several second ramp segments 34 protrude outward, and the direction of increasing height is opposite to that of the first ramp segment 43.

[0033] The first ramp segment 43 and the second ramp segment 34 are in corresponding positions and are made of an elastic material. The setting of the two ramp segments is to prevent that during the test, when the drone 9 simulates landing, it will exert a downward pressure on the mounting plate 2, which may

[0034] It will also carry its own rotation, which is relatively short. At this time, the first ramp section 43 and the second ramp section 34 come into contact with each other. Because their height increasing directions are opposite, the first ramp section 43 guides the second ramp section 34 to slide obliquely upward, preventing the upper cover 3 and the middle cover 4 from excessive contact, resulting in accidental touch, loosening or tightening of the thread. When it is considered to disassemble or install, because the ramp section material is compressible, the downward pressure can overcome its elastic force to complete the disassembly and installation.

[0035] The mounting plate 2 is fixedly arranged on the upper end surface of the upper cover 3. A compression spring 32 is arranged in the through hole 33 of the upper cover 3. The upper end of the compression spring 32 abuts tightly against the mounting plate 2, and the lower end abuts tightly against the upper end surface of the middle cover 4;

[0036] The lower end of the universal shaft 6 is spherical, and the universal joint 7 has a spherical cavity.

[0037] As Figure 7 shown, the support rod 11 is inserted into the sleeve 12 and can slide up and down in the sleeve 12. The lower end of the sleeve 12 is fixedly connected to the base 10. It can cooperate with the lifting test of the experimental unmanned aerial vehicle 9. The fastening screw 13 is threadedly connected to the sleeve 12, and its end abuts tightly against the support rod 11. When the lifting test is not required, the fastening screw 13 is tightened to lock the sleeve 12 and the support rod 11.

[0038] Explanation of the mechanism principle:

[0039] This mechanism is designed based on the principles of threaded connection structure and rectangular groove meshing structure.

[0040] The multi-rotor unmanned aerial vehicle 9 is fixed to the mounting plate 2 by 4 screws, integrating the unmanned aerial vehicle, the mounting plate 2, the upper cover 3, and the middle cover 4, and covering them on the fixed block 5. Press down hard to overcome the elastic force of the compression spring 32 and rotate clockwise. When the rectangular protrusion 31 is inserted into the rectangular groove 41, it will drive the middle cover 4 to rotate together. When the middle cover 4 rotates, it is threadedly connected to the fixed block 5 and fixed. The internal and external threads are screwed together clockwise and unscrewed counterclockwise for corresponding installation and disassembly work. After releasing the downward pressure on the mounting plate 2, the mounting plate 2 is pushed upward by the spring 32, separating the rectangular protrusion 31 from the rectangular groove 41. At this time, the upper cover 3 can rotate freely relative to the fixed block 5 without causing the middle cover 4 to rotate and loosen the thread.

[0041] During the test process, when it is necessary to remove the drone 9 from the test bench for algorithm program adjustment, press down the mounting plate 2 to overcome the elastic force of the compression spring 32 and rotate counterclockwise. When the rectangular protrusion 31 is inserted into the rectangular groove 41, it will drive the middle cover 4 to rotate together. When the middle cover 4 rotates, the threaded connection with the fixed block 5 is separated. After separation, the drone 9, the mounting plate 2 and the upper cover 4 can be taken off the test bench as a whole. At this time, it is no longer necessary to remove the drone 9 from the mounting plate 2 because the algorithm program can be adjusted completely at this time. Thus, the disassembly is simplified and time is saved.

[0042] This test bench has multiple test modes: when the fixing bolts 8 and the fastening screws 13 are tightened, the upper cover 3 and the middle cover 4 can rotate freely, and only the pure horizontal rotation test of the drone can be carried out; when the fastening screw 13 is loosened, the drone lifting simulation test can be carried out; when the fixing bolt 8 is loosened, the multi-angle free rotation test can be carried out.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "clockwise" and "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0044] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A multi-rotor UAV test bench, characterized in that, It includes a base (10), a support rod (11), a mounting plate (2), an upper cover (3), a middle cover (4), a fixing block (5), a universal shaft (6), a universal joint (7), and a fixing bolt (8); The support rod (11) is arranged on the base (10). The upper end of the support rod (11) is fixedly connected to the universal joint (7). The lower end of the universal shaft (6) is rotatably connected to the universal joint (7). The fixing bolt (8) is threadedly connected to the universal joint (7), and its end extends into the universal joint (7) and abuts against the lower end of the universal shaft (6); The fixing block (5) is cylindrical, and its lower end is threadedly connected to the upper end of the universal shaft (6). The outer circumference of the fixing block (5) has an external thread; The middle cover (4) is in the shape of a circular cover, sealed at the upper end and open at the lower end. An internal thread (42) is provided inside. A number of rectangular grooves (41) are formed on the outer edge of the upper end face along the circumferential array direction. The middle cover (4) is sleeved on the fixing block (5) and connected by threads; The upper cover (3) is in the shape of a circular cover, sealed at the upper end and open at the lower end. A number of rectangular protrusions (31) protrude outward along the circumferential array direction inside the upper end face. A through hole (33) is provided at the upper end. The upper cover (3) is sleeved on the middle cover (4), and a retaining ring (35) is installed at the lower end position of the upper cover (3); The mounting plate (2) is fixedly arranged on the upper end face of the upper cover (3). A compression spring (32) is arranged in the through hole (33) of the upper cover (3). The upper end of the compression spring (32) abuts against the mounting plate (2), and the lower end abuts against the upper end face of the middle cover (4), A number of protruding first slope segments (43) are arranged on the outer edge of the upper end face of the middle cover (4) along the circumferential array direction, with the height increasing in the counterclockwise direction; A number of second slope segments (34) protrude outward along the circumferential array direction inside the upper end face of the upper cover (3), and the direction of height increase is opposite to that of the first slope segment (43). The support rod (11) is inserted into the sleeve (12) and can slide up and down in the sleeve (12). The lower end of the sleeve (12) is fixedly connected to the base (10). The fastening screw (13) is threadedly connected to the sleeve (12), and its end abuts against the support rod (11).

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