Middle-and-large-sized tilt-rotor unmanned aerial vehicle bench test system

Abstract

The invention discloses a medium-and-large-sized tilt-rotor unmanned aerial vehicle rack test system, which comprises a foundation, two balance structures, two mobile platforms, a lifting platform, a rack structure, a climbing step, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform, a lifting platform and a lifting platform, and is characterized in that the lifting platform, the lifting platform and the lifting platform are sequentially arranged on the foundation along the horizontal direction; the two moving platforms are movably arranged on the two sides of the rack structure respectively and can be close to or far away from the rack structure, the unmanned aerial vehicle is lifted to be flush with the rack structure through the lifting machine, then the unmanned aerial vehicle is moved to the rack structure, a certain height difference is kept between the unmanned aerial vehicle and the ground, and the test efficiency is improved. The mobile platform is convenient to use according to needs, a person can conveniently carry out detection around the unmanned aerial vehicle, the balance structure supports the suspended part of the unmanned aerial vehicle, unmanned aerial vehicle tires are assisted to support the unmanned aerial vehicle, stable stress of the unmanned aerial vehicle is kept, and deflection of the unmanned aerial vehicle is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of bench test systems for medium and large tilt-rotor unmanned aerial vehicles (UAVs), and more specifically, relates to a bench test system for medium and large tilt-rotor UAVs. Background Art

[0002] After prototype construction, subsystem testing, and final assembly and adjustment, an aircraft undergoes ground landing tests before its maiden flight to verify its overall functionality. Bench testing for tilt-rotor drones before their maiden flight measures the force, vibration, and temperature characteristics of the aircraft during landing, examining the operational status of subsystems such as the powertrain, mechanical transmission, aircraft structure, and electrical system. Furthermore, the drone must be maintained at a certain height above the ground to ensure that the rotor blades are out of, or nearly out of, ground effect.

[0003] In addition to meeting the aforementioned basic testing requirements, the test bench design must also offer convenient and rapid maintainability, operability, and the safety of personnel and materials. Furthermore, it must be capable of transmitting sensor data stably and with low latency. Compared to other ground testing methods for medium and large tilt-rotor aircraft, methods for elevating the aircraft include pit-digging and vehicle-mounted testing.

[0004] The pit digging method is to form a height difference between the rotor blade and the ground by excavating the ground. This method has the disadvantages of long construction period, high construction cost, environmental damage and restoration problems, difficulty in security, difficulty in maintenance, and complex drainage in the pit. The vehicle-mounted method can realize the test with incoming flow, but it is limited by the scale of the test site and test vehicle, and cannot meet the testing of medium and large tilt-rotor aircraft above the ton level. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a bench test system for medium and large tilt-rotor UAVs, which solves the problem that when testing UAVs, a certain height difference needs to be maintained with the ground so that the rotor blades are separated or nearly separated from the influence of the ground effect. The existing pit digging method is costly and difficult to drain the pit, and the vehicle-mounted method is subject to environmental restrictions and cannot meet the testing requirements of medium and large tilt-rotor aircraft above the ton level.

[0006] In order to achieve the above-mentioned object, the present invention provides a medium-to-large-sized tilt-rotor UAV test bench system, comprising a foundation, on which a lift, a bench structure and climbing steps are sequentially arranged in a horizontal direction;

[0007] Two balance structures, which are respectively arranged on both sides of the platform structure and are used to support the drone to maintain balance;

[0008] Two mobile platforms are movably arranged on both sides of the platform structure and can move closer to or farther away from the platform structure.

[0009] Optionally, the elevator is embedded in the foundation, and is flush with the foundation when the elevator is retracted, and is flush with the platform structure when the elevator is raised. The lifting platform of the elevator is provided with a first guide rail and a wheel chock, and the foundation is provided with a guide line that matches the guide rail. After the drone enters the first guide rail through the guide line, it is limited by the wheel chock.

[0010] Optionally, a second guide rail coaxial with the first guide rail is provided on the top of the platform structure, and the first guide rail and the second guide rail are respectively groove-shaped.

[0011] Optionally, the wheel chock comprises:

[0012] an insert block, the insert block being in the shape of a right triangle, the horizontal surface of the insert block being detachably connected to the first guide rail, and the vertical surface of the insert block being disposed adjacent to the tire of the drone;

[0013] A constraint groove, one end of which is provided with an open groove that matches the tire of the drone, and the other end of which is connected to the vertical surface of the insert;

[0014] A positioning pin, wherein the first guide rail and the second guide rail are respectively provided with positioning holes, and one end of the positioning pin passes through the horizontal plane of the insert and is connected with the positioning hole.

[0015] Optionally, an organic belly balance is provided on the platform structure.

[0016] Optionally, a towing system is provided on the platform structure, and the towing system includes:

[0017] A winch towing motor, wherein the winch towing motor is arranged on the platform structure;

[0018] A towing tool, the towing tool comprising a connecting clamp, the connecting clamp being used for detachably connecting to the drone;

[0019] A steel cable, one end of which is connected to the connecting clamp, and the other end of which is connected to the winch towing motor.

[0020] Optionally, the balance structure includes:

[0021] A lifting mechanism, wherein the bottom end of the lifting mechanism is arranged on the base, and the top end of the lifting mechanism is provided with a horizontal posture adjustment device and a bracket, and the bracket is used to contact the drone.

[0022] Optionally, an equipment room is provided at the lower end of the ascending steps.

[0023] Optionally, the mobile platform is slidably arranged between the balance structure and the platform structure via a slide rail, and the slide rail is parallel to the first guide rail.

[0024] Optionally, a data acquisition system is also included to monitor the status of the drone and obtain real-time data of the drone.

[0025] The present invention provides a bench test system for medium and large tilt-rotor UAVs, which has the following beneficial effects:

[0026] 1. The medium and large tilt-rotor UAV test bench system connects the top of the bench structure and the ground through a climbing step. The UAV is lifted to the same level as the bench structure by a lift, and then moved to the bench structure to maintain a certain height difference between the UAV and the ground, which facilitates the rotor blades to be separated from or nearly separated from the influence of the ground effect. The mobile platform is easy to use as needed and convenient for personnel to conduct inspections around the UAV. The balance structure supports the suspended part of the UAV, and the auxiliary UAV tires support the UAV and keep the UAV stable to prevent the UAV from tilting.

[0027] This medium-to-large tilt-rotor UAV bench test system utilizes a mobile platform to meet the requirement for unobstructed testing beneath the rotor blades. The compact structure, with a physical access platform and equipment compartment behind the work platform, allows cables to be routed away from the wake turbulence zone. This design efficiently enables balance force measurement, vibration testing, and temperature testing of tilt-rotor UAVs under multiple operating conditions, generating effective data that provides a reliable basis for overall aircraft design optimization and performance evaluation.

[0028] 3. This medium and large tilt-rotor UAV bench test system uses an embedded elevator and towing system to achieve the entry, installation and exit of UAVs more conveniently and quickly than climbing and suspension approach methods. It is simpler and more convenient to use than digging pits and vehicle-mounted methods.

[0029] 4. Conventional wheel chocks can only limit the longitudinal displacement of the aircraft, but cannot prevent the aircraft from rolling over, lateral movement, and other degrees of freedom. The present invention, through the unique design of unconventional wheel chocks, can limit the aircraft's movement in six degrees of freedom, ensuring the safety of the aircraft during the lifting process.

[0030] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0032] Figure 1 A schematic structural diagram of a bench test system for medium to large tilt-rotor UAVs according to an embodiment of the present invention is shown.

[0033] Figure 2 A side view of a bench test system for medium to large tilt-rotor UAVs according to an embodiment of the present invention is shown.

[0034] Figure 3 A top view of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0035] Figure 4 A schematic structural diagram of a towing system of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0036] Figure 5 A structural schematic diagram of a towing tooling of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0037] Figure 6 A schematic structural diagram of a belly balance of a driving mechanism of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0038] Figure 7 A schematic structural diagram of a balance structure of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0039] Figure 8 An exploded view of a test bench structure of a medium-to-large tilt-rotor UAV test bench system according to an embodiment of the present invention is shown.

[0040] Figure 9 A schematic structural diagram of a wheel chock of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0041] Figure 10 A schematic structural diagram of a locating pin of a wheel chock of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0042] Figure 11 A schematic diagram of a test state of a medium-to-large tilt-rotor UAV bench test system according to an embodiment of the present invention is shown.

[0043] Description of reference numerals:

[0044] 1. Foundation; 2. Elevator; 3. Platform structure; 4. Climbing steps; 5. Scale structure; 6. Mobile platform; 7. Wheel chocks; 8. Belly scale; 9. Towing system; 10. First guide rail; 11. Second guide rail; 12. Guide markings;

[0045] 31. Working platform; 32. Alignment hole;

[0046] 51. Honeycomb frame; 52. Diagonal ribs; 53. Curved panel;

[0047] 71. Insert; 72. Constraint groove; 73. Positioning pin;

[0048] 91. Winch towing motor; 92. Towing tooling. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0050] like Figure 1-11 As shown, a medium-to-large tilt-rotor UAV bench test system includes:

[0051] A foundation 1, on which a lift 2, a platform structure 3 and climbing steps 4 are arranged in sequence in a horizontal direction;

[0052] Two balance structures 5, which are respectively arranged on both sides of the platform structure 3, are used to support the UAV to maintain balance;

[0053] Two movable platforms 6 are movably arranged on both sides of the platform structure 3 and can be moved closer to or away from the platform structure 3 .

[0054] Specifically, the climbing step 4 connects the top of the platform structure 3 and the ground, and the drone is lifted to the level of the platform structure 3 by the elevator 2, and then the drone is moved to the platform structure 3, so that the drone maintains a certain height difference with the ground (the height is more than 1.5 times the diameter D of the drone's rotor blade disk), which is convenient for the rotor blade disk to be separated from or nearly separated from the influence of the ground effect. The mobile platform 6 is easy to use as needed, and it is convenient for personnel to conduct inspections around the drone. The balance structure 5 supports the suspended part of the drone, assists the drone tires in supporting the drone and keeps the drone stable to prevent the drone from tilting.

[0055] Furthermore, the foundation 1 is a concrete foundation 1. The gantry structure 3 and the mobile platform 6 are respectively square steel tube truss structures, each of which is provided with a counterweight cabin. The gantry structure 3 is connected by welding of multiple sections of truss structures (preferably argon arc welding, but also manual arc welding and gas welding). The bottom is fixed to the concrete foundation 1 by angle steel and bolts. The upper end is a flat plate-shaped working platform 31. The second guide rail 11 is provided on the working platform 31. The working platform 31 is a solid steel plate of 10mm to 20mm or a honeycomb sandwich steel plate with a slightly larger thickness. The working platform 31 is provided with four in-line holes 32 for the passage of sensor cables, drone power supply cables, and drone communication cables. The mobile platform 6 can also be provided with guardrails and positioning connection structures to facilitate the positioning and stability of the mobile platform 6 after it is moved into place.

[0056] In this embodiment, the elevator 2 is embedded in the foundation 1. When the elevator 2 is retracted, it is flush with the foundation 1. When the elevator 2 is raised, it is flush with the platform structure 3. The lifting platform of the elevator 2 is provided with a first guide rail 10 and a wheel chock 7. The foundation 1 is provided with a guide line 12 that matches the guide rail. After the drone enters the first guide rail 10 through the guide line 12, it is limited by the wheel chock 7.

[0057] Specifically, the guide marking 12 cooperates with the first guide rail 10 to facilitate the movement and positioning of the drone. When the elevator 2 is retracted, it is flush with the foundation 1. When the elevator 2 is raised, it is flush with the platform structure 3 to facilitate the stable translation of the drone. The wheel chock 7 cooperates with the first guide rail 10 to limit the drone to prevent the drone from moving during the lifting process.

[0058] In this embodiment, a second guide rail 11 coaxial with the first guide rail 10 is provided on the top of the platform structure 3 , and the first guide rail 10 and the second guide rail 11 are respectively in a groove shape.

[0059] Specifically, the second guide rail 11 is used to guide the movement of the drone. At the same time, the second guide rail 11 can also be used in conjunction with the wheel chock 7. The groove-shaped structure can limit the left and right displacement of the drone.

[0060] In this embodiment, the wheel chock 7 includes:

[0061] The insert 71 is in the shape of a right triangle, the horizontal surface of which is detachably connected to the first guide rail 10, and the vertical surface of which is arranged close to the tire of the drone;

[0062] A constraint groove 72, one end of which is provided with an open groove that matches the tire of the drone, and the other end of the constraint groove 72 is connected to the vertical surface of the insert 71;

[0063] Positioning pin 73 , positioning holes are respectively provided on the first guide rail 10 and the second guide rail 11 , and one end of the positioning pin 73 passes through the horizontal surface of the insert 71 and is connected to the positioning pin 73 .

[0064] Specifically, the constraint groove 72 limits the forward and backward and up and down movement of the drone, and cooperates with the first guide rail 10 and the second guide rail 11 to realize the six-direction constraint of the drone. The positioning pin 73 and the positioning hole are detachably connected to facilitate the positioning of the drone.

[0065] Furthermore, the constraint groove 72 is set according to the tire shape, overlapping with the tire's axial projection area by 25% to 37%, and overlapping with the tire's vertical projection area by no more than 50%. The constraint groove 72 can limit the movement on the tire and can approach the tire horizontally along the first guide rail 10 and the second guide rail 11 without hindrance.

[0066] In this embodiment, an organic belly balance 8 is provided on the platform structure 3 .

[0067] Specifically, the belly of the drone is supported by a belly balance 8 , which is manually assembled after the drone is moved to the platform structure 3 .

[0068] Furthermore, the belly balance 8 is movably or detachably arranged on the top of the platform structure 3, and the second guide rail 11 is divided into multiple sections to avoid the belly balance 8. Because the three tires of the drone, two in front and one behind, are arranged in an isosceles triangle, the three tires ensure that at least one is connected to the second guide rail 11 at any time.

[0069] In this embodiment, a towing system 9 is provided on the platform structure 3, and the towing system 9 includes:

[0070] A winch towing motor 91 is provided on the platform structure 3;

[0071] A towing tool 92, the towing tool 92 includes a connecting clamp, and the connecting clamp is used for detachably connecting to the drone;

[0072] A steel cable, one end of which is connected to the connecting clamp, and the other end of which is connected to the winch towing motor 91.

[0073] Specifically, the platform structure 3 is provided with a reversing wheel and an avoidance hole for cooperating with the steel cable. The towing system 9 assists in manually towing the drone to move, making it convenient for the drone to move from the lifting platform to the top of the platform structure 3. The winch towing motor 91 is set inside the platform structure 3.

[0074] Furthermore, the connecting clamp includes a rectangular frame structure consisting of two ears and two cross bars, and the cross bars can pass through the reserved holes of the tail landing gear of the UAV to withstand the drag shear force.

[0075] In this embodiment, the balance structure 5 includes:

[0076] The lifting mechanism has a bottom end arranged on the base, and a top end of the lifting mechanism is provided with a horizontal attitude adjustment device and a bracket, and the bracket is used to contact the UAV.

[0077] Specifically, the bottom end of the lifting mechanism is connected to the base through a flange, and the top end of the lifting mechanism is connected to the horizontal attitude adjustment device through a flange. The attitude angle of the bracket is adjusted through the horizontal attitude adjustment device to ensure stable contact between the bracket and the drone.

[0078] Furthermore, the bracket includes a honeycomb frame plate 51, oblique ribs 52, a curved panel 53, and screw holes. The upper surface of the curved panel 53 fits the lower surface of the main wing of the drone and is fixed to the skin under the main wing ribs. It plays the role of receiving the load transmitted by the balance and can effectively disperse the concentrated load from the balance to ensure structural safety.

[0079] Furthermore, the belly balance 8 and the balance structure 5 have the same structure. When the belly balance can be raised and lowered, it can be connected and installed in a retracted state. At this time, the balance structure 5 is not needed to lift the drone.

[0080] In this embodiment, an equipment room is provided at the lower end of the ascending step 4 .

[0081] Specifically, the equipment room is used to place DC power supply equipment, test area power supply control facilities, emergency power supply, data acquisition and forwarding equipment, test auxiliary tooling 92 and materials, etc. The bench structure 3 is provided with a circuit harness and avoidance holes connecting the drone and the equipment room, so that the data acquisition system harness can avoid the influence of the drone's airflow.

[0082] Furthermore, the equipment room can also provide a place for personnel to take a short break, or the equipment room can be in the form of a shelf structure, and other equipment that is not directly connected to the aircraft or step test equipment can be placed in a small container outside the test area.

[0083] In this embodiment, the mobile platform 6 is slidably disposed between the balance structure 5 and the platform structure 3 via a slide rail, and the slide rail is parallel to the first guide rail 10 .

[0084] Specifically, the mobile platform 6 moves as needed, that is, it is convenient for personnel to use and debug when needed, so as to avoid interference with the drone action during detection. The mobile platform 6 can be equipped with protective structures such as guardrails, and the positioning waist holes and locking bolts are used to connect and limit the position.

[0085] Furthermore, the slide rails are I-beams, and the mobile platform 6 is equipped with a single set of pulleys or a double set of pulleys sandwiched between them. A removable sliding connection between the sidewalls of the mobile platform 6 and the gantry structure 3 is provided with guide grooves and guide blocks. These dovetail grooves and guide blocks, when connected, restrict the mobile platform 6 from swaying in a direction perpendicular to the axis of the slide rails relative to the gantry structure 3.

[0086] In this embodiment, a data acquisition system is also included for monitoring the status of the drone and acquiring real-time data of the drone.

[0087] Specifically, the data acquisition system includes vibration sensors, temperature sensors, data acquisition boxes, solution servers, monitoring and control terminals, DC power supplies, and UPS emergency power supplies;

[0088] After receiving the signal output from the vibration sensor, temperature sensor, and force balance, the data acquisition box transmits the data downstream to the solution server. The solution server is equipped with signal solution software to output the data as usable data. The monitoring and control terminal receives the data from the solution server and provides it to the test personnel to monitor and control the test status.

[0089] The DC power supply provides DC power for aircraft, sensors, test equipment, lighting devices, etc. The UPS emergency power supply is located between the DC power supply and the electrical appliance circuit, providing temporary power supply when the DC power supply fails.

[0090] In this implementation, a medium-to-large tilt-rotor UAV bench test system is used, taking the use of a medium-to-large tilt-rotor UAV as an example:

[0091] (1) Preparation for entry:

[0092] Before the aircraft approaches the airport, refuel the aircraft or charge the power battery to ensure that the aircraft has sufficient fuel or power;

[0093] Before the aircraft approaches, install temperature sensor patches or probes on the target part of the tilt-rotor drone, install vibration sensor patches on the target part of the tilt-rotor drone, comb the temperature sensor and vibration sensor cables and fix them to the surface of the fuselage to form a single cable bundle, drag it out from the tail of the aircraft, and temporarily fix the cable bundle to the fuselage;

[0094] (2) On-site installation:

[0095] The elevator 2 is in a compressed state, and the tires of the tilt-rotor UAV landing gear are aligned with the guide mark 12 and pushed onto the elevator 2 so that the tires enter the first guide rail 10;

[0096] Wheel chocks 7 are installed on the three landing gear tires to limit the drone in six directions. The drone is a three-wheeled drone, and the three wheel chocks 7 are arranged in a relative manner, two in front and one behind;

[0097] Lift the tilt-rotor UAV with the elevator 2 so that the elevator 2 is flush with the upper surface of the platform structure 3;

[0098] Remove the wheel chocks 7 and move the UAV to the platform structure 3. Alternatively, use the towing system 9. The towing tool 92 is installed on the tail landing gear of the tilt-rotor UAV. Turn on the winch towing motor 91 to tighten the steel cable and set the towing speed to be less than 0.02 m / s.

[0099] The maintenance personnel ascend the working platform 31 of the platform structure 3 via the climbing steps 4 to remove the wheel chocks 7 and connect the towing tool 92;

[0100] During the towing process, the longitudinal position of the aircraft is adjusted to facilitate the installation and connection of the balance structure 5 and the belly balance 8;

[0101] When in use, first connect the balance structure 5, then lift the drone with the balance structure 5 to facilitate the connection of the belly balance 8, and then lower the drone after the belly balance 8 is connected, and connect the wiring harness and fixed wheel block 7 for limiting after adjustment.

[0102] After completing all necessary preparations, disassemble the mobile platform and push it to the end of the slide rail at the edge of the test area, keeping the mobile platform 6 away from the drone and securing it to the protective net attachment at the edge of the test area with a cable.

[0103] When the tilt-rotor UAV is in the horizontal and vertical test states of the nacelle, observe the vibration state of the test bench structure 3 and the mobile platform, and add counterweights as appropriate to improve the vibration;

[0104] During the test, the data acquisition box receives the signal output from the vibration sensor, temperature sensor, and force balance, and transmits the data downstream to the solution server. The solution server is equipped with signal solution software to output the data as usable data. The monitoring and control terminal receives the data from the solution server and provides it to the test personnel to monitor and control the test status.

[0105] The DC power supply provides DC power for aircraft, sensors, test equipment, lighting devices, etc. The UPS emergency power supply is located between the DC power supply and the electrical appliance circuit, providing temporary power supply when the DC power supply fails.

[0106] (3) Decommissioning and disassembly:

[0107] The test exit basically follows the reverse process of the entry process;

[0108] First, separate the drone and the wheel chocks 7, and pre-position the wheel chocks 7 on the first guide rail 10 of the elevator 2. The two wheel chocks 7 prevent the drone from sliding to the side of the elevator 2 away from the platform structure 3 (if there are enough wheel chocks 7, some wheel chocks 7 can be retained when the drone is towed from the elevator 2 to the platform structure 3); then, sequentially separate the drone's belly balance 8 and the balance structure 5;

[0109] Move the drone to the elevator 2. The preset wheel chocks 7 prevent the drone from falling. When the drone moves to the first guide rail 10, the wheel chocks 7 completely limit the drone and return to the elevator 2.

[0110] Remove wheel chock 7 and move the drone away.

[0111] Medium and large tilt-rotor drones have a relatively narrow range of adaptability to environmental, weather, and meteorological factors during testing, including temperature, wind speed, rainfall, snowfall, dust, and ambient brightness. If the drones require extensive installation and deployment time for each entry and exit, it's easy to miss the appropriate time window. When the time span is too long, local weather and environmental conditions are often prone to inaccurate forecasts. Therefore, excessive preparation time can even prevent the opportunity window from being captured.

[0112] The entry and exit method of the present invention can effectively shorten the test preparation time and capture the test time window in time. Through the medium and large tilt-rotor UAV bench test system, the embedded elevator and towing system can realize the entry, installation and exit of the UAV more conveniently and quickly than the climbing and suspension approach methods. It is simpler and more convenient to use than the pit digging method and vehicle-mounted method.

[0113] At the same time, mobile platforms and climbing steps can reduce manufacturing and maintenance costs compared to mechanical or electric lifting platforms, greatly reducing system complexity and difficulty of use; they can be safer and more flexible than temporary electric lifting vehicles.

[0114] During testing, if the drone itself or on-stage test equipment malfunctions or requires status correction, personnel must access the work platform to perform maintenance operations. Furthermore, ground testing of tilt-rotor drones requires clear space under, in front of, and behind the rotors, so the maintenance platform is located away from the test area during testing. However, problems and other maintenance needs that arise during testing are often urgent, requiring the test team to be able to handle them quickly.

[0115] The electric lifting method has high manufacturing costs. Due to the motor power and the mechanical tolerance of the mechanical structure, it needs to be made into a multi-stage type, which requires complex operations such as segmented lifting and aligning the limit holes one by one. On the one hand, temporary electric lifting vehicles are difficult to place and adjust. On the other hand, when people rise to a certain height, the lifting vehicle will inevitably shake. When the ambient wind speed is high, the shaking will be more significant. Fixed lifting vehicles are cumbersome to operate, and if they are not fixed, there are obvious safety hazards.

[0116] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A medium to large tilt-rotor UAV bench test system, characterized by: include: A foundation, on which a lift, a platform structure and climbing steps are sequentially arranged in a horizontal direction; Two balance structures, which are respectively arranged on both sides of the platform structure and are used to support the drone to maintain balance; Two mobile platforms are movably arranged on both sides of the platform structure and can move closer to or farther away from the platform structure.

2. A medium to large tilt-rotor UAV bench test system according to claim 1, characterized in that: The elevator is embedded in the foundation. When the elevator is retracted, it is flush with the foundation. When the elevator is raised, it is flush with the platform structure. The lifting platform of the elevator is provided with a first guide rail and a wheel chock. The foundation is provided with a guide line that matches the guide rail. After the drone enters the first guide rail through the guide line, it is limited by the wheel chock.

3. A medium to large tilt-rotor UAV bench test system according to claim 2, characterized in that: A second guide rail coaxial with the first guide rail is provided on the top of the platform structure, and the first guide rail and the second guide rail are respectively groove-shaped.

4. A medium to large tilt-rotor UAV bench test system according to claim 2, characterized in that: The wheel chock comprises: an insert block, the insert block being in the shape of a right triangle, the horizontal surface of the insert block being detachably connected to the first guide rail, and the vertical surface of the insert block being disposed adjacent to the tire of the drone; A constraint groove, one end of which is provided with an open groove that matches the tire of the drone, and the other end of which is connected to the vertical surface of the insert; A positioning pin, wherein the first guide rail and the second guide rail are respectively provided with positioning holes, and one end of the positioning pin passes through the horizontal plane of the insert and is connected with the positioning hole.

5. The bench test system for medium to large tilt-rotor UAVs according to claim 1, characterized in that: An organic belly balance is arranged on the platform structure.

6. A medium to large tilt-rotor UAV bench test system according to claim 1, characterized in that: The platform structure is provided with a towing system, and the towing system comprises: A winch towing motor, wherein the winch towing motor is arranged on the platform structure; A towing tool, the towing tool comprising a connecting clamp, the connecting clamp being used for detachably connecting to the drone; A steel cable, one end of which is connected to the connecting clamp, and the other end of which is connected to the winch towing motor.

7. A medium to large tilt-rotor UAV bench test system according to claim 1, characterized in that: The balance structure comprises: A lifting mechanism, wherein the bottom end of the lifting mechanism is arranged on the base, and the top end of the lifting mechanism is provided with a horizontal posture adjustment device and a bracket, and the bracket is used to contact the drone.

8. The bench test system for medium to large tilt-rotor UAVs according to claim 1, characterized in that: An equipment room is provided at the lower end of the ascending step.

9. A medium to large tilt-rotor UAV bench test system according to claim 2, characterized in that: The mobile platform is slidably arranged between the balance structure and the platform structure via a slide rail, and the slide rail is parallel to the first guide rail.

10. A medium to large tilt-rotor UAV bench test system according to claim 1, characterized in that: It also includes a data acquisition system for monitoring the status of the drone and obtaining real-time data from the drone.

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