CN113120228B - Unmanned helicopter for electric power application - Google Patents

Abstract

The invention relates to the technical field of unmanned aerial vehicles, and particularly discloses an unmanned helicopter for electric power application. The unmanned helicopter comprises a stander, a power device and a rotor wing assembly arranged on the stander; the rotor wing assembly comprises rotor wing blades, each rotor wing blade is formed by alternately connecting a plurality of first rotor wing pieces and a plurality of second rotor wing pieces, and the strength of each first rotor wing piece is higher than that of each second rotor wing piece; the power device is arranged on the rack and connected with the output end of the rotor wing assembly, and the power device is used for driving the rotor wing assembly to rotate. Utilize the first rotor piece that intensity is different and the alternate connection setting of second rotor piece, can not only guarantee rotor subassembly normal operating, can also make rotor blade break off and break away from in a second rotor piece department when suffering external environment destruction to guarantee that remaining rotor blade still can continue the operation, avoided leading to the condition emergence of power device damage because of rotor blade destruction, and then prolonged unmanned helicopter's life.

Description

Unmanned helicopter for power application

Technical Field

The invention relates to the technical field of unmanned aerial vehicles, in particular to an unmanned helicopter for electric power application.

Background

An unmanned helicopter is an unmanned aircraft that is operated by a radio remote control device and self-contained program control means, or is operated autonomously, either completely or intermittently, by an onboard computer. Unmanned helicopters tend to be more suitable for tasks that are too "fool, dirty, or dangerous" than manned airplanes. The unmanned helicopter is widely applied to the fields of aerial photography, agriculture, plant protection, miniature self-timer, express transportation, disaster relief, wild animal observation, infectious disease monitoring, surveying and mapping, news report, power inspection, disaster relief, film and television shooting, romantic manufacturing and the like, greatly expands the application of the unmanned helicopter, and actively expands the industrial application and the unmanned helicopter technology in developed countries.

In the field of electric power construction, tools need to be delivered to cable repairers who repair cables at high positions, so that delivery of objects is difficult, most of the tools need to be manually taken down or manually sent up, transportation is inconvenient, high in danger and low in transportation efficiency, and therefore unmanned helicopters are often used for transporting objects at present.

When a rotor blade of the unmanned aerial vehicle flies, if the rotor blade touches a peripheral hard object, damage is easily caused; and the blades are blocked, so that great torsional force can be caused to a power shaft of the steering engine instantly, and even the power device is damaged.

Disclosure of Invention

The invention aims to provide an electric power application unmanned helicopter, which aims to solve the problem of a power device which can be damaged when blades of the unmanned helicopter are blocked.

In order to achieve the purpose, the invention adopts the following technical scheme:

an unmanned helicopter for electric power application comprises a stander, a rotor wing assembly and a power device; the rotor assembly is arranged on the rack and comprises rotor blades, the rotor blades are formed by alternately connecting a plurality of first rotor blades and a plurality of second rotor blades, and the strength of the first rotor blades is higher than that of the second rotor blades; the power device is installed in the frame, power device with the output of rotor subassembly is connected, power device is used for the drive the rotor subassembly is rotatory.

Wherein the first rotor blade and the second rotor blade are welded to each other.

Further, the first rotor blade and the second rotor blade are both made of light titanium alloy composite materials.

Preferably, the rack comprises a mounting rack, a left machine leg and a right machine leg are mounted at the bottom of the mounting rack, and the mounting rack is made of insulating materials.

Further, the unmanned helicopter of electric power application still includes and locates left side machine foot with two counter weight supports between the right side machine foot, just counter weight support's extending direction with left side machine foot with right side machine foot is mutually perpendicular, two counter weight support connects respectively left side machine foot with the both ends of right side machine foot.

Furthermore, two support clamping grooves are formed in the counterweight support, the support clamping grooves can be erected on the left machine leg and the right machine leg, and a rubber layer is laid in the support clamping grooves.

Preferably, the unmanned helicopter for power application further comprises a suspension rib, and the suspension rib is arranged on the left machine leg and the right machine leg and used for suspending objects.

Further, hang the muscle and include the arc strengthening rib, a left side machine foot with all be equipped with one on the right side machine foot the arc strengthening rib, and two the arc strengthening rib is just right each other.

Preferably, the rack is further provided with a first loading box and a second loading box, and the first loading box and the second loading box are used for loading objects.

Preferably, a balance bar is further mounted on the frame, and the balance bar is used for keeping balance.

The invention has the beneficial effects that:

utilize the first rotor piece that intensity is different and the alternate connection setting of second rotor piece, can not only guarantee rotor subassembly normal operating, can also make rotor blade break off and break away from in a second rotor piece department when suffering external environment destruction to guarantee that remaining rotor blade still can continue the operation, avoided leading to the condition emergence of power device damage because of rotor blade destruction, and then prolonged unmanned helicopter's life.

Drawings

Fig. 1 is a schematic structural diagram of an unmanned helicopter for electric power application according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a wire wheel according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a counterweight bracket according to an embodiment of the invention;

FIG. 4 is a schematic view of a landing assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an unmanned helicopter for power application provided by a third embodiment of the present invention.

In the figure:

101. a mounting frame; 102. a first loading compartment; 103. a second loading bin; 104. a balancing pole; 105. a live indicator light; 106. an arc-shaped reinforcing rib; 110. a wire wheel vertical plate; 111. a vertical plate hole; 120. a wire wheel member; 121. a cable shaft; 122. a fixed shaft; 123. a threaded hole; 210. a left leg; 220. a right leg; 300. a counterweight bracket; 310. the bracket is clamped in the groove; 400. a power plant; 500. a steering engine; 600. a rotor assembly; 610. a first rotor blade; 620. a second rotor blade; 700. a clamping assembly; 800. a landing assembly; 810. a ground plate; 820. an adjustment shaft; 830. a landing assembly motor; 840. a sensing unit; 850. an articulation member; 910. a test line; 920. and detecting a device motor.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Example one

As shown in fig. 1, the present embodiment provides an unmanned helicopter for electric power application, which includes a rack, a power device 400, a steering engine 500, a rotor assembly 600, and a manipulator device, a left machine leg 210 and a right machine leg 220 are installed at the bottom of the rack, a leakage detection device is installed between the left machine leg 210 and the right machine leg 220, the leakage detection device is used for detecting a voltage difference of the ground below between the left machine leg 210 and the right machine leg 220, the power device 400, the steering engine 500, and the rotor assembly 600 are both installed in the rack, the rotor assembly 600 is connected with an output end of the power device 400, the power device 400 is used for driving the rotor assembly 600 to rotate, the steering engine 500 is used for adjusting an inclination angle of the rotor assembly 600, the manipulator device is installed at the bottom of the rack and is used for clamping a high-voltage line head, the manipulator device includes a clamping assembly 700, and the periphery of the clamping assembly 700 is coated with an insulating layer.

When the high-voltage line cable is maintained, the broken cable enables the ground to be conductive, and maintenance personnel cannot easily approach to the high-voltage line head without solving the leakage condition. The embodiment provides an unmanned helicopter for power application to solve the problem. Specifically, this unmanned helicopter flies to target detection area and descends, electric leakage detection device can detect the ground voltage difference, when the voltage difference is in the safe value within range, maintenance person can walk target detection area and maintain the high-voltage line end of a thread, when the voltage difference is greater than the safe value scope, centre gripping subassembly 700 can be with the centre gripping of high-voltage line end of a thread, this unmanned helicopter rises and drives the high-voltage line end of a thread and break away from in ground, the cladding can be with the insulating isolation of high-voltage electricity in the insulating layer of centre gripping subassembly 700's periphery, avoid the high-voltage electricity to cause the influence to the electronic component on this unmanned helicopter.

In this embodiment, the left chassis 210 and the right chassis 220 are both made of metal conductive material, the leakage detecting device includes the live indicator 105, and the live indicator 105 is used for displaying whether there is leakage on the ground between the left chassis 210 and the right chassis 220. When the live-line indicator lamp 105 is lighted for work, the ground between the left machine leg 210 and the right machine leg 220 of a maintenance person far away from the high-voltage wire stub can be prompted to have an electric leakage condition.

In this embodiment, the rack includes a mounting frame 101, and the left leg 210 and the right leg 220 are both mounted at the bottom of the mounting frame 101, and the mounting frame 101 is made of an insulating material. When the unmanned helicopter lands on a target detection area, the left machine leg 210 and the right machine leg 220 are both conductive, and in order to ensure that electronic elements mounted on a rack are not damaged by current breakdown, the left machine leg 210 and the right machine leg 220 are both mounted on the mounting frame 101, so that the mounting frame 101 is made of an insulating material.

Preferably, still install the vision module in the frame, the vision module is used for detecting the location high-voltage line end of a thread, guarantees that clamping assembly 700 can accurately find and press from both sides tight high-voltage line end of a thread.

In this embodiment, rotor assembly 600 includes a rotor blade comprised of a plurality of first rotor blades 610 alternating with a plurality of second rotor blades 620, the first rotor blades 610 having a higher strength than the second rotor blades 620. Utilize the first rotor piece 610 that intensity is different and the alternate connection setting of second rotor piece 620, can not only guarantee rotor subassembly 600 normal operating, can also make rotor blade break off and break away from in a second rotor piece 620 department when suffering external environment destruction to guarantee that remaining rotor blade still can continue the operation, avoided taking place because of the condition that rotor blade destruction leads to power device 400 to damage, and then prolonged unmanned helicopter's life.

In the present embodiment, the first rotor plate 610 and the second rotor plate 620 are welded to each other. The welding processing cost is low, and the cross section is not weakened; the manufacturing and processing are convenient, and the automatic operation can be realized; the connection has good tightness and large structural rigidity. In other embodiments of the present invention, the first rotor plate 610 and the second rotor plate 620 are manufactured by 3D printing.

Preferably, the first rotor plate 610 and the second rotor plate 620 are both made of a light titanium alloy composite material. The composite material has the advantages of high specific strength and specific stiffness, good vibration damping performance, good fatigue resistance and simple forming process.

In this embodiment, the unmanned helicopter for electric power application further comprises a reel assembly and a suspension rib, the reel assembly comprises a reel 120 and two counterweight supports 300, the reel 120 and the counterweight supports 300 are arranged between the left machine leg 210 and the right machine leg 220, the extending directions of the reel 120 and the counterweight supports 300 are perpendicular to the left machine leg 210 and the right machine leg 220, two ends of the reel 120 are respectively installed in the middle of the left machine leg 210 and the middle of the right machine leg 220 and used for accommodating cables, and the two counterweight supports 300 are respectively connected with two ends of the left machine leg 210 and the right machine leg 220; the suspension ribs are provided on the left leg 210 and the right leg 220 for suspending an object. By means of the arrangement of the wire wheel piece 120, the storage and transportation of the cable can be realized, the operation of taking the cable by an operator is facilitated, the knotting of the cable is reduced, the operation efficiency is improved, the balance of the unmanned helicopter is improved by the arrangement of the counterweight support 300, and the risk that the unmanned helicopter inclines and falls due to unstable gravity center when the cable is taken is reduced; the wire wheel piece 120 and the two counterweight brackets 300 are arranged between the left machine leg 210 and the right machine leg 220 and are perpendicular to the left machine leg 210 and the right machine leg 220, so that the space occupied by the unmanned helicopter is reduced. The suspension of the object can be completed by the arrangement of the suspension ribs, and the transportation of the object capable of being suspended is facilitated. The unmanned helicopter has the advantages that the cables and the suspended objects can be conveniently transported, the types and modes of transporting the objects by the unmanned helicopter are increased, and the efficiency and the effect of material transportation are improved.

As shown in fig. 2, the pulley 120 includes a cable shaft 121 and a fixing shaft 122 penetrating through the cable shaft 121, the cable shaft 121 is coaxially and rotatably connected to the fixing shaft 122, the cable is wound around the cable shaft 121, and both ends of the fixing shaft 122 are respectively installed at the middle of the left leg 210 and the middle of the right leg 220. The operation of taking of cable can be accomplished through the mode of pull to operating personnel to the rotation connection setting of cable axle 121 makes, has both improved the efficiency of work, can not influence the effect of accomodating of cable axle 121 to the cable again.

Specifically, the cable shaft 121 is further provided with a positioning buckle, and the positioning buckle can be clamped with the cable. The positioning buckle is utilized to fix the end of the cable, so that the coiled cable is prevented from loosening, the frequency of adjusting and fastening the cable by an operator is reduced, and the manual operation time and cost are reduced.

With reference to fig. 1, the middle of the left leg 210 and the middle of the right leg 220 are both provided with a wire wheel vertical plate 110, the two wire wheel vertical plates 110 are opposite to each other, and two ends of the fixing shaft 122 are respectively connected to the two wire wheel vertical plates 110. The arrangement of the vertical pulley plate 110 determines the installation position of the pulley 120, and the selection of the middle positions of the left machine leg 210 and the right machine leg 220 facilitates the operation of taking the cable from different directions by operators.

Preferably, the pulley vertical plate 110 is provided with a vertical plate hole 111, both ends of the fixed shaft 122 are provided with screw holes 123, and a screw can pass through the vertical plate hole 111 and be screwed in the screw hole 123. The bolt connection is stable and reliable, and the detachable connection of the fixed shaft 122 with the left leg 210 and the right leg 220 facilitates the replacement and maintenance of the cable wheel 120 and the winding and adjustment of the cable on the cable shaft 121 by an operator.

In the present embodiment, a plurality of the riser holes 111 are provided. Specifically, four vertical plate holes 111 are provided, the wire wheel vertical plate 110 extends upwards, and the four vertical plate holes 111 are arranged side by side along the direction in which the wire wheel vertical plate 110 extends. The provision of the plurality of riser holes 111 facilitates adjustment of the position of the wire wheel member 120 by an operator.

As shown in fig. 3, two bracket fastening grooves 310 are formed in the counterweight bracket 300, and the bracket fastening grooves 310 can be erected on the left leg 210 and the right leg 220. The arrangement of the bracket clamping groove 310 enables the counterweight bracket 300 to be stably installed on the left machine leg 210 and the right machine leg 220, and avoids the risk of deviation or falling off of the counterweight bracket 300 caused by accidents. Specifically, a rubber layer is laid in the bracket clamping groove 310. The arrangement of the rubber layer not only ensures the connection stability of the counterweight support 300 with the left machine leg 210 and the right machine leg 220, but also avoids the damage to the left machine leg 210 and the right machine leg 220 caused by the erection of the counterweight support 300.

As shown in fig. 4, the unmanned helicopter for electric power application further comprises a landing control assembly and four landing assemblies 800, which are respectively installed at two ends of the left leg 210 and two ends of the right leg 220, wherein the landing assemblies 800 comprise a ground plate 810, a sensing unit 840 and a driving unit capable of driving the ground plate 810 to lift, the ground plate 810 is used for contacting the ground, and the sensing unit 840 is used for measuring an included angle and a distance between the ground plate 810 and the ground below the ground plate 810; the landing control assembly is in communication connection with the sensing unit 840 and is used for processing an included angle measurement result and an interval measurement result of the sensing unit 840, when the included angle measurement result is within a safety threshold range, the power application unmanned helicopter starts to land, and the landing control assembly controls the driving unit to drive the grounding plate 810 to move according to the interval measurement result; and when the measurement result of the included angle exceeds the range of the safety threshold value, stopping the electric power application unmanned helicopter from landing. With the help of the above arrangement, whether the ground below is suitable for landing or not can be judged by the landing control assembly according to the included angle measurement result obtained by processing the signals sent by the four sensing units 840, and under the condition that the ground below is suitable for landing, the landing control assembly can also control each ground plate 810 to respectively carry out lifting operation according to the interval measurement result obtained by processing the signals sent by the four sensing units 840, so that the unmanned helicopter can automatically and stably land, the workload of operators is reduced, the landing safety and accuracy of the unmanned helicopter are ensured, and the working efficiency of the unmanned helicopter is improved. Specifically, the safe threshold range is determined by the adjustment limits of the adjustment axis 820.

Preferably, the driving unit is screwed on the left leg 210 or the right leg 220; the drop control assembly is in wireless communication with the sensing unit 840.

In the present embodiment, the contact area of the ground plate 810 with the ground is larger than the contact area of the left leg 210 and the right leg 220, and the above arrangement is used to ensure the stable landing of the unmanned helicopter.

Preferably, the dropping assembly 800 further includes a hinge 850, and both ends of the hinge 850 are hinged to the ground plate 810 and the driving unit, respectively. Specifically, the hinge 850 is provided in plurality. The arrangement of the hinge 850 not only enables the unmanned helicopter to be in contact with the ground, but also enables the contact to be smooth through continuous fine adjustment, and also can slow down the direct influence of the ground on the driving unit and avoid the risk of damage to the driving unit caused by ground impact.

In this embodiment, the driving unit includes an adjusting shaft 820 and a lowering assembly motor 830 for driving the adjusting shaft 820, and the adjusting shaft 820 is hinged to a hinge 850. In other embodiments of the present invention, the driving unit includes a cylinder, and a telescopic rod of the cylinder is hinged to the hinge 850. The driving unit is simple in principle and structure, easy to install and maintain and long in service life.

Specifically, a rubber layer is laid on the bottom surface of the ground plate 810. The rubber layer plays a buffering role, and the stable landing of the unmanned helicopter can be further realized.

Preferably, the sensing unit 840 is mounted on the top surface of the ground plate 810 and includes a distance sensor and an angle sensor. The position selection of the sensing unit 840 not only reduces the occupied space of the landing assembly 800, but also facilitates the measurement of the included angle and the distance between the butt joint floor 810 of the distance sensor and the angle sensor and the ground below the ground plate 810.

With continued reference to fig. 1, the suspension bar includes an arc-shaped reinforcing bar 106, and one arc-shaped reinforcing bar 106 is disposed on each of the left leg 210 and the right leg 220, and the two arc-shaped reinforcing bars 106 are opposite to each other. The objects can be effectively hung by the aid of the arc-shaped reinforcing ribs 106, and the two ends of the same object can be hung by means of the two arc-shaped reinforcing ribs 106 which are arranged oppositely.

In this embodiment, a balance bar 104 is further mounted on the frame, and the balance bar 104 is used for keeping balance. Specifically, the balance bar 104 is mounted to one side of the mounting bracket 101.

In this embodiment, the rack is further provided with a first loading box 102 and a second loading box 103, the first loading box 102 and the second loading box 103 are used for loading objects, for example, tools such as universal watches and wrenches can be loaded on the first loading box 102 and the second loading box 103, so that the carrying weight of maintenance personnel is reduced, and the labor intensity is reduced. Specifically, the first loading box 102 is mounted on the side of the mounting frame 101 away from the balancing bar 104, and the second loading box 103 is mounted on the top end of the mounting frame 101.

Example two

The difference between the present embodiment and the first embodiment is that the leakage detecting device of the present embodiment includes a voltmeter, one of detection ends of the voltmeter is installed at one end of the left leg 210, which is far away from the rack, and the other detection end of the voltmeter is installed at one end of the right leg 220, which is far away from the rack, and the voltmeter is used for displaying a voltage difference of the ground below between the left leg 210 and the right leg 220. The inlet wire end of the voltmeter is a positive electrode, the outlet wire end of the voltmeter is a negative electrode, the two ends of the voltmeter are respectively installed on the left machine leg 210 and the right machine leg 220, and when the unmanned helicopter lands on a target detection area, the voltmeter can detect the voltage difference between the ground of the left machine leg 210 and the ground of the right machine leg 220.

EXAMPLE III

As shown in fig. 5, the difference between the present embodiment and the first embodiment is that a test line 910 and a potential detection device are disposed on the left leg 210 or the right leg 220 of the present embodiment, the test line 910 is connected to the potential detection device, the test line 910 is used for abutting against a target detection area, the potential detection device can obtain a potential of the target detection area, and a maintenance worker can determine whether the unmanned helicopter is directly above a high-voltage line head through the potential value. Optionally, the sheetmetal is installed to the one end of keeping away from mounting bracket 101 of test wire 910, and on the one hand, test wire 910 can rely on the gravity of sheetmetal to straighten, and on the other hand, test wire 910 can rely on sheetmetal and ground active contact electrically conductive.

Optionally, a detection device motor 920 is further disposed on the left leg 210 or the right leg 220, the output end of the detection device motor 920 is provided with a rotating roller, one end of the test line 910 is connected to the rotating roller, and the detection device motor 920 is used for driving the rotating roller to wind or release the test line 910. The test line 910 is coiled or released through the motor 920 of the detection device, and the other end of the test line 910 is abutted to the target detection area, so that the unmanned helicopter does not need to be lifted frequently. Optionally, a connecting rod is disposed between the left leg 210 and the right leg 220, and the detection device motor 920 is mounted on the connecting rod.

Optionally, the unmanned helicopter for power application further comprises an automatic positioning system, and the automatic positioning system is used for positioning and recording the position of the target detection area.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An unmanned helicopter for electric power applications, comprising:

a frame;

a rotor assembly (600) mounted to the frame, the rotor assembly (600) including a rotor blade comprised of a plurality of first rotor blades (610) and a plurality of second rotor blades (620) alternately connected, the first rotor blades (610) being stronger than the second rotor blades (620);

the power device (400) is arranged on the stander, the power device (400) is connected with the output end of the rotor wing assembly (600), and the power device (400) is used for driving the rotor wing assembly (600) to rotate;

the rotor blade is broken and detached at one of the second rotor blades (620) when the rotor blade is damaged by an external environment, and the rotor blade can continue to operate when the rotor blade is connected to the power unit (400).

2. The power application drone of claim 1, wherein the first rotor plate (610) and the second rotor plate (620) are welded to each other.

3. The power application unmanned helicopter of claim 2, wherein the first rotor plate (610) and the second rotor plate (620) are both a lightweight titanium alloy composite.

4. The unmanned helicopter of claim 1, wherein the frame comprises a mounting frame (101), the bottom of the mounting frame (101) is provided with a left foot (210) and a right foot (220), and the mounting frame (101) is made of an insulating material.

5. The unmanned helicopter of claim 4, further comprising two weight brackets (300) disposed between the left leg (210) and the right leg (220), wherein the weight brackets (300) extend in a direction perpendicular to the left leg (210) and the right leg (220), and the two weight brackets (300) are respectively connected to two ends of the left leg (210) and the right leg (220).

6. The unmanned helicopter for power application as claimed in claim 5, wherein the counterweight bracket (300) has two bracket fastening grooves (310), the bracket fastening grooves (310) can be erected on the left machine leg (210) and the right machine leg (220), and a rubber layer is laid in the bracket fastening grooves (310).

7. The unmanned helicopter of claim 4, further comprising a suspension bar disposed on the left leg (210) and the right leg (220) for suspending an object.

8. The unmanned helicopter of claim 7, wherein the suspension rib comprises an arc-shaped reinforcing rib (106), one arc-shaped reinforcing rib (106) is arranged on each of the left machine leg (210) and the right machine leg (220), and the two arc-shaped reinforcing ribs (106) are opposite to each other.

9. The unmanned helicopter of any of claims 1-8, further characterized in that a first stowage box (102) and a second stowage box (103) are disposed on said airframe, said first stowage box (102) and said second stowage box (103) being configured to stow an object.

10. An unmanned helicopter for electric power applications according to any of claims 1-8 wherein said airframe further mounts a balance bar (104), said balance bar (104) being used to maintain balance.

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