Mobile unmanned aerial vehicle thrust measuring rack

Abstract

The utility model relates to a movable unmanned aerial vehicle thrust measuring rack, belongs to the technical field of unmanned aerial vehicles, and solves the problem that a movable thrust measuring rack for a large fixed-wing unmanned aerial vehicle is lacked in the prior art. The rack comprises a front platform and a rear platform, and the front platform and the rear platform are arranged in a T shape; the front platform is provided with a sliding rail seat in sliding connection, and the sliding rail seat is matched with a nose landing gear airplane wheel of the unmanned aerial vehicle; the rear platform is a thrust measuring platform and comprises a movable frame, a fixed frame and a thrust measuring assembly, the movable frame is provided with an aircraft wheel fixing device matched with an aircraft wheel of a main landing gear of the unmanned aerial vehicle, and the thrust measuring assembly is arranged between the movable frame and the fixed frame.

Description

TECHNICAL FIELD

[0001] The utility model relates to unmanned plane technical field especially relates to a movable unmanned plane thrust measuring rack. BACKGROUND

[0002] With the rapid development and wide application of unmanned plane technology, the performance requirement of unmanned plane is also increasingly improved. As one of the important indexes of the flight performance of unmanned plane, thrust has a direct influence on the flight speed, climbing rate and maneuverability of unmanned plane. Therefore, accurate measurement and evaluation of the thrust of unmanned plane have important significance for improving the flight performance and safety of unmanned plane.

[0003] Before the test flight of large fixed-wing unmanned plane, the performance calibration is carried out on the engine ground test bed to check and record the multiple performance indexes of the engine. However, the working environment of the engine on the ground test bed is different from that of the engine after installation, especially the intake condition. Due to the limitation of the installation position and size of the engine on the plane and other objective conditions, the intake condition of the engine after installation is worse than that of the engine on the ground test bed. The change of the intake condition will inevitably lead to the change of the engine performance. SUMMARY

[0004] In view of the above analysis, the embodiments of the utility model aim to provide a movable unmanned plane thrust measuring rack to solve the problem of the movable thrust test rack for large fixed-wing unmanned plane.

[0005] The utility model mainly aims to realize the following technical scheme:

[0006] The utility model provides a movable unmanned plane thrust measuring rack, including front platform (3) and rear platform (2), the front platform (3) and rear platform (2) are placed in T type;

[0007] The front platform (3) is provided with the slide rail seat (18) of sliding connection, and the slide rail seat is matched with the front landing gear wheel of unmanned plane (1);

[0008] The rear platform (2) is a thrust measuring platform, and it comprises a movable frame (6), a fixed frame (8) and a thrust measuring assembly, the movable frame is provided with a wheel fixing device (11) matched with the main landing gear wheel of the unmanned plane (1), and the thrust measuring assembly is arranged between the movable frame (6) and the fixed frame (8).

[0009] Further, the movable frame (6) and the fixed frame (8) are connected through a flexible member.

[0010] Further, the thrust measuring assembly comprises two symmetrically arranged thrust measuring devices (9), and the symmetric center line is located on both sides of the center line of the longitudinal beams of the movable frame (6) and the fixed frame (8).

[0011] Further, the thrust measuring device (9) comprises a mechanical sensor, a sensor support, a force support and a top rod.

[0012] The mechanical sensor is installed on the movable frame (6) through the sensor support.

[0013] The top rod is fixed at one end on the force support and connected with the fixed frame (8), and the other end is opposite to the mechanical sensor along the direction perpendicular to the relative movement direction of the movable frame (6) and the fixed frame (8).

[0014] Further, the wheel fixing device (11) is a basket type structure with an upward opening, and the rear end is installed on the side of the movable frame (6) and connected with the movable frame (6) through a T-shaped groove rail (12); and the front end is a cover plate which can be opened and closed.

[0015] Further, the movable frame (6) and the fixed frame (8) are further provided with a safety device (7).

[0016] The safety device (7) comprises a support, a screw rod and a round nut; the support is fixed on the movable frame (6), the screw rod is fixed on the fixed frame (8) opposite to the support, and the locking and unlocking are realized through the up-down movement of the round nut.

[0017] Further, the rear platform (2) is provided with two counterweights (14); each counterweight (14) is provided with a lifting ring and symmetrically arranged between the two thrust measuring devices of the fixed frame (8).

[0018] Further, the slide rail seat (18) is arranged on the front platform (3) through two slide rails (19); the two slide rails (19) are symmetrically arranged along the center line of the front platform (3).

[0019] The slide rail seat (18) is further provided with a sliding block which slides on the slide rail (19).

[0020] Further, the four corners of the front platform (3) are further provided with one caster (16) respectively, and one foot cup (17) is arranged beside each caster.

[0021] Further, the front platform (3) and the rear platform (2) are both provided with a lifting ear seat (15).

[0022] Compared with the prior art, the utility model can realize at least one of the following beneficial effects:

[0023] 1. The mobile unmanned aerial vehicle thrust measurement bench of the utility model is suitable for large fixed-wing unmanned aerial vehicle engine test, the structure of two platforms separated in front and back is designed for the problem that the distance of three wheels of large fixed-wing unmanned aerial vehicle is far, which not only meets the requirement of road transportation, but also guarantees the accuracy of test, because of the separation structure, the bench can be transported to plateau, island, low temperature environment, and unmanned aerial vehicle thrust test can be carried out in different environments.

[0024] 2. The mobile unmanned aerial vehicle thrust measurement bench of the utility model reduces the front wheel friction through the linear slide rail of the front platform, and effectively improves the precision of thrust measurement.

[0025] 3. The rear bench of the utility model fixes the wheel fixing device on the side, reduces the height of the wheel bearing surface, so that the unmanned aerial vehicle can be more conveniently tested on the platform. At the same time, this design also facilitates the operation and adjustment in the test process.

[0026] 4. The rear bench of the utility model is provided with a safety protection device and a counterweight, which guarantees safety, and through adjusting the mass of the counterweight, thrust test can be carried out for different unmanned aerial vehicles.

[0027] In the utility model, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the utility model will be described in the subsequent specification, and some advantages can become apparent from the specification or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the contents specially pointed out in the specification and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings are only used for the purpose of showing specific embodiments, and are not considered as limiting the utility model, and the same reference signs represent the same parts in the whole drawings.

[0029] Figure 1 It is the overall structure schematic view of the unmanned aerial vehicle thrust measurement bench in the utility model embodiment;

[0030] Figure 2 It is the front platform side view of the unmanned aerial vehicle thrust measurement bench in the utility model embodiment;

[0031] Figure 3 It is the front platform front view of the unmanned aerial vehicle thrust measurement bench in the utility model embodiment;

[0032] Figure 4 It is the rear platform side view of the unmanned aerial vehicle thrust measurement bench in the utility model embodiment;

[0033] Figure 5This is a front view of the rear platform of the UAV thrust measurement platform in this embodiment of the present invention;

[0034] Figure 6 This is a top view of the rear platform of the UAV thrust measurement rig in this embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the wheel fixing device in an embodiment of the present invention.

[0036] Figure label:

[0037] 1-UAV; 2-Rear platform; 3-Front platform; 4-Safety cable; 5-Auxiliary ramp; 6-Moving frame; 7-Safety device; 8-Fixed frame; 9-Thrust measuring device; 10-Flexible component; 11-Wheel fixing device; 12-T-slot rail; 13-Wedge leveling assembly; 14-Counterweight; 15-Lifting lug; 16-Cast wheel; 17-Foot cup; 18-Slide rail seat; 19-Slide rail; 20-Non-standard rigid structure platform; Detailed Implementation

[0038] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0039] A specific embodiment of this utility model discloses a mobile unmanned aerial vehicle (UAV) thrust measurement platform, such as... Figure 1 As shown, the platform includes a front platform 3 and a rear platform 2, which are arranged in a T-shape.

[0040] Specifically, such as Figure 1 As shown, a large fixed-wing UAV 1 typically uses a tricycle landing gear. The two main wheels are symmetrically arranged laterally at a certain distance from the center of gravity of the aircraft, while the nose wheel is positioned below the nose of the aircraft. The three wheels are relatively far apart. Since the test bench in this embodiment is movable, the entire test bench cannot be too large. This embodiment designs an independent and unconnected front platform 3 to support the nose landing gear wheels, and a rear platform 2 to support the two main landing gear wheels.

[0041] Furthermore, the front platform 3 is provided with a sliding rail seat 18, which is matched with the front landing gear wheels of the UAV 1.

[0042] Specifically, the front platform is used to bear the front landing gear wheels and does not participate in the thrust test of the unmanned aerial vehicle. If the front landing gear wheels are simply placed on the front platform, a large rolling friction force between the front landing gear wheels and the front platform may occur during the test, which balances the engine thrust and affects the measurement accuracy of the rear platform thrust. Therefore, a slide rail seat that can be slidably connected is arranged on the front platform 3, and the front landing gear wheels are fixed on the slide rail seat. The low friction coefficient of the slide rail seat slidingly reduces the friction force of the front wheels as much as possible.

[0043] Further, the slide rail seat 18 is arranged on the front platform 3 through two slide rails 19; the two slide rails 19 are symmetrically arranged along the center line of the front platform 3.

[0044] The slide rail seat 18 is also provided with a sliding block that slides on the slide rail 19.

[0045] Specifically, as shown in Figure 2 and Figure 3 As shown in the drawings, since the large fixed-wing unmanned aerial vehicle is often heavy, the front landing gear needs to bear a large vertical load. Therefore, the front landing gear adopts a double-wheel design, which can increase the contact area of the front landing gear with the ground, disperse the weight of the unmanned aerial vehicle, reduce the pressure borne by a single wheel, and thus improve the durability and safety of the landing gear.

[0046] The front platform includes a non-standard rigid structure platform 20, and two slide rails 19 are arranged above the platform. Each slide rail 19 is fixed on the upper side of the non-standard rigid structure platform 20 through bolts and is located at the center of the platform in the heading direction. The two slide rails are symmetrically arranged along the center line of the platform in the lateral direction. Two sliding blocks are respectively connected to the two slide rail seats through bolts, and the two sliding blocks move forward and backward on the two slide rails.

[0047] Further, one caster 16 is arranged at each corner of the front platform 3, and one foot cup 17 is arranged beside each caster.

[0048] Specifically, in order to facilitate adjustment of the distance between the front platform and the rear platform to adapt to unmanned aerial vehicles of different fuselage sizes, one caster 16 is arranged at each corner of the front platform, and is installed below the non-standard rigid structure platform 20 through bolts. One foot cup 17 is arranged beside each caster. The foot cup is a long bolt structure that passes through the non-standard rigid structure platform 20. The foot cup base can be moved up and down by rotating the rocker. Before the thrust test, the height of each foot cup is adjusted so that the four casters are away from the ground, and the plane of the front platform is adjusted to be in the same plane as the rear platform.

[0049] Further, the rear platform 2 is a thrust measuring platform, comprising a movable frame 6, a fixed frame 8 and a thrust measuring assembly, the movable frame is provided with a wheel fixing device 11 matched with the main landing gear wheels of the unmanned aerial vehicle 1, and the thrust measuring assembly is arranged between the movable frame 6 and the fixed frame 8.

[0050] Further, the movable frame 6 and the fixed frame 8 are connected through flexible members.

[0051] Specifically, as shown in Figure 4 and Figure 5 , the movable frame 6 and the fixed frame 8 are connected through four flexible members 10. The fixed frame 8 remains fixed during the thrust test, and the movable frame 6 is driven by the main landing gear wheels to move relative to the fixed frame 8.

[0052] Further, the thrust measuring assembly comprises two symmetrical thrust measuring devices 9, and the center lines of the two symmetrical thrust measuring devices are located on both sides of the center lines of the longitudinal beams of the movable frame 6 and the fixed frame 8.

[0053] Specifically, the thrust measuring assembly is responsible for directly measuring the size of the thrust of the unmanned aerial vehicle, and the two thrust measuring devices 9 are symmetrically arranged on the rear platform, which can average the errors caused by asymmetric factors, and help to ensure the accuracy and reliability of the measurement. At the same time, the symmetrical arrangement helps to balance the stress between the movable frame and the fixed frame, thereby enhancing the structural stability of the entire thrust measuring platform.

[0054] Further, the thrust measuring device 9 comprises a mechanical sensor, a sensor support, a load-bearing support and a top rod;

[0055] The mechanical sensor is installed on the movable frame 6 through the sensor support;

[0056] One end of the top rod is fixed on the load-bearing support and connected with the fixed frame 8, and the other end is opposite to the mechanical sensor along the direction perpendicular to the relative movement direction of the movable frame 6 and the fixed frame 8.

[0057] Specifically, the mechanical sensor can convert the thrust into an electrical signal, thereby realizing the quantitative measurement of the thrust; the sensor support is fixed on the movable frame through bolts, and is used for supporting and fixing the mechanical sensor to ensure its stability during measurement; the load-bearing support is connected with the fixed frame through bolts, and is used for bearing and transmitting the thrust from the outside; the top rod is used for transmitting the thrust borne by the load-bearing support to the mechanical sensor.

[0058] Before the thrust test, the top rod has a certain distance from the mechanical sensor, and they do not contact each other, and the reading of the mechanical sensor is 0; after the test starts, during the movement of the dynamic frame driven by the unmanned aerial vehicle, the dynamic frame and the fixed frame are relatively displaced, the dynamic frame moves along the forward direction as a whole, the top rod contacts and extrudes the mechanical sensor, and the mechanical sensor generates a reading, thereby measuring the thrust of the unmanned aerial vehicle.

[0059] Further, the wheel fixing device 11 is a basket type structure with an upward opening; the rear end is installed on the side of the dynamic frame 6 and connected with the dynamic frame 6 through a T-shaped groove rail 12; and the front end is a cover plate that can be opened and closed.

[0060] Specifically, as shown in Figure 6 The rear platform is a concave structure, and two wheel fixing devices 11 are fixed on the side of the dynamic frame 6, and the two wheels of the main landing gear of the unmanned aerial vehicle are fixed in the two wheel fixing devices. Since the wheel fixing devices are arranged on the side of the dynamic frame 6 instead of on the top of the rack, the height of the wheel bearing surface is reduced, which facilitates the landing of the unmanned aerial vehicle on the rack. During the test, the wheels of the main landing gear can resist the front end surface of the wheel fixing device, drive the entire dynamic frame to move, and extrude the pressure sensor, so as to measure the engine thrust.

[0061] As shown in Figure 7 The wheel fixing device 11 is a basket type structure made of steel plate by tailor welding, the rear end surface thereof is a mounting surface, and the wheel fixing device is connected with the T-shaped groove rail 12 on the dynamic frame 6 through bolts and keys; the two side steel plates of the wheel fixing device are provided with reinforcing ribs to ensure sufficient strength and rigidity; the front end thereof is a cover plate that can be opened and closed, and the two sides of the cover plate are connected through a pin shaft. When the unmanned aerial vehicle lands on the rack, the pin shaft on one side is pulled out, the cover plate is rotated open, the wheels of the unmanned aerial vehicle enter the wheel fixing device, and after completion, the cover plate is rotated back and the pin shaft is inserted to fix the wheels in the internal frame.

[0062] The T-shaped groove rail 12 is fixed on the side of the dynamic frame through a pin hole and a bolt, and the wheel fixing device 11 moves on the T-shaped groove rail to adjust the distance between the two wheel fixing devices, thereby adapting to different unmanned aerial vehicle models.

[0063] Further, the dynamic frame 6 and the fixed frame 8 are further provided with a safety device 7; the safety device 7 includes a support, a screw rod and a round nut; the support is fixed on the dynamic frame 6, the screw rod is fixed on the fixed frame 8 opposite to the support, and the two are locked and unlocked through the up and down movement of the round nut.

[0064] Specifically, the rear platform is provided with four safety devices 7 arranged between the cross beams of the movable frame and the fixed frame on both sides of the rear platform, two on each side. The safety device 7 comprises a support, a screw rod and a round nut; the support is fixed on the movable frame as a supporting part of the safety device; the screw rod is fixed on the fixed frame, and the round nut can move up and down by rotating the screw rod. During thrust measurement, the round nut keeps a certain distance from the support to ensure that it does not affect the thrust measurement; when the flexible part needs to be maintained and repaired, the round nut is rotated to move upward and abut against the support, at this time, the weight of the movable frame is entirely borne by the safety device, and the flexible part can be removed under the condition that the movable frame is not displaced.

[0065] Further, the rear platform 2 is provided with two counterweights 14; each counterweight 14 is provided with a lifting ring and symmetrically placed between the two thrust measurement devices of the fixed frame 8.

[0066] Specifically, as shown in Figure 1 , one safety cable 4 is arranged on each side of the fixed frame 8 of the rear platform 2. Since the thrust measurement rack of the present embodiment is movable, some experimental sites have pre-embedded conditions, and there are pull rings on the ground, so the safety cable 4 can be connected and fixed with the pull ring to fix the fixed frame of the rear platform without moving. When the surrounding environment does not have conditions to use the safety cable 4, in order to prevent the rear platform from being pushed away by the thrust of the unmanned aerial vehicle, as shown in Figure 6 , symmetrically placed counterweights 14 are arranged, the weight of the fixed frame is increased by increasing the friction, and the thrust of the unmanned aerial vehicle is balanced, and the weight of the counterweight can be adjusted according to the weight of the unmanned aerial vehicle.

[0067] It should be noted that the movable frame of the rear platform is a frame structure, the main body is formed by butt welding of rectangular steel pipes, and each counterweight is lowered from the gap of the movable frame frame by hoisting and pressed on the fixed frame below the movable frame.

[0068] Further, the front platform 3 and the rear platform 2 are both provided with lifting lug seats 15.

[0069] Specifically, the front platform 3 and the rear platform 2 are lifted from the transport vehicle to the test site through the lifting lug seats 15, and the rear platform is leveled through the wedge leveling assembly 13 as shown in Figure 5 , the front platform is moved to a position suitable for the unmanned aerial vehicle by the casters and the foot cups are adjusted so that the front platform and the rear platform are on the same horizontal plane.

[0070] After the front platform and the rear platform are fixed and positioned, the auxiliary slope 5 is connected to the front platform and the rear platform through hooks, and the unmanned aerial vehicle 1 is pushed to the platform through the auxiliary slope 5 in the form of reverse traction; wherein the front landing gear wheels of the unmanned aerial vehicle fall onto the slide rail seats of the front platform and are fixed, and the two main landing gear wheels on the rear side of the unmanned aerial vehicle fall onto the two wheel fixing devices of the rear platform.

[0071] In summary, the mobile unmanned aerial vehicle thrust measurement bench has the following beneficial effects:

[0072] 1、 The mobile unmanned aerial vehicle thrust measurement bench of the utility model is suitable for large fixed-wing unmanned aerial vehicle engine testing, and the structure of two platforms separated in front and back is designed for the problem of long distance between three wheels of the large fixed-wing unmanned aerial vehicle, which meets the requirements of road transportation and guarantees the accuracy of testing.

[0073] 2、 The mobile unmanned aerial vehicle thrust measurement bench, the front platform reduces the friction of the front wheel through the linear slide rail, and effectively improves the precision of thrust measurement.

[0074] 3、 The rear bench of the utility model fixes the wheel fixing device on the side surface, reduces the height of the wheel bearing surface, and enables the unmanned aerial vehicle to be more conveniently placed on the bench for testing.

[0075] 4、 The rear bench is provided with a safety protection device and a counterweight, which guarantees safety and enables different unmanned aerial vehicles to be tested for thrust through adjustment of the mass of the counterweight.

[0076] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A mobile unmanned aerial vehicle (UAV) thrust measurement platform, characterized in that, The front platform (3) and the rear platform (2) are arranged in a T shape; The front platform (3) is provided with a sliding rail seat (18) matched with the front landing gear wheels of the unmanned aerial vehicle (1); The rear platform (2) is a thrust measurement platform, comprising a movable frame (6), a fixed frame (8) and a thrust measurement assembly, the movable frame (6) is provided with a wheel fixing device (11) matched with the main landing gear wheels of the unmanned aerial vehicle (1), and the thrust measurement assembly is arranged between the movable frame (6) and the fixed frame (8).

2. The gantry of claim 1, wherein, The movable frame (6) and the fixed frame (8) are connected by a flexible member.

3. The gantry of claim 2, wherein, The thrust measurement assembly comprises two symmetrically arranged thrust measurement devices (9), and the symmetric center line is located on both sides of the center line of the longitudinal beam of the movable frame (6) and the fixed frame (8).

4. The gantry of claim 3, wherein, The thrust measurement device (9) comprises a mechanical sensor, a sensor support, a load bearing support and a top rod; The mechanical sensor is installed on the movable frame (6) through the sensor support; The top rod is fixed at one end of the load bearing support and connected with the fixed frame (8), and the other end is opposite to the mechanical sensor along the direction perpendicular to the relative movement direction of the movable frame (6) and the fixed frame (8).

5. The gantry of claim 1 wherein, The wheel fixing device (11) is a basket type structure with the opening upward, and the rear end is installed on the side of the movable frame (6) and connected with the movable frame (6) through a T-shaped groove rail (12); the front end is a cover plate which can be opened and closed.

6. The gantry of claim 5, wherein, The movable frame (6) and the fixed frame (8) are further provided with a safety device (7); The safety device (7) comprises a support, a screw rod and a round nut; the support is fixed on the movable frame (6), the screw rod is fixed on the fixed frame (8) opposite to the support, and the locking and unlocking are realized by the up and down movement of the round nut.

7. The gantry of claim 6 wherein, The rear platform (2) is provided with two counterweights (14); each counterweight (14) is provided with a lifting ring and symmetrically arranged between the two thrust measurement devices of the fixed frame (8).

8. The gantry of claim 1, wherein, The sliding rail seat (18) is arranged on the front platform (3) through two sliding rails (19); the two sliding rails (19) are symmetrically arranged along the center line of the front platform (3); The sliding rail seat (18) is further provided with a sliding block which slides on the sliding rail (19).

9. The gantry of claim 8, wherein, Each of the four corners of the front platform (3) is further provided with a castor (16), and each castor is provided with a foot cup (17).

10. A gantry according to any one of claims 1-9, characterized in that The front platform (3) and the rear platform (2) are both provided with a lifting lug (15).

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