Aircraft carrying device

Abstract

The embodiment of the invention relates to the technical field of transfer of non-wheeled vertical take-off and landing aircrafts, in particular to an aircraft carrying device. Moving wheels adopt the layout of diagonal steering wheels and universal wheels, steering is flexible, multiple walking modes of the device can be achieved, transverse moving, in-situ steering, crab moving and other moving modes are achieved, meanwhile, the front wheels and the rear wheels can rotate reversely to reduce the turning radius of the whole device during steering after diagonal arrangement, and the device is suitable for position adjustment in narrow sites.

Description

Technical Field

[0001] The invention relates to the technical field of non-wheeled vertical take-off and landing aircraft transportation, and in particular to an aircraft transport device. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] Since non-wheeled vertical take-off and landing aircraft do not have moving wheels, they need to be moved at the airport or other working conditions with the help of a transfer platform after landing. Existing transfer cloud platform products basically adopt the front-end steering and rear-end directional layout. Figure 1 The general structure of two existing products is shown. It is difficult for the existing cloud-turning platform to adjust the position of the tail directional wheels when entering the bottom of the aircraft, and the turning radius is too large during transportation. The travel method is also relatively simple, similar to an ordinary forklift. Summary of the invention

[0004] In order to solve the problem that the turning radius of a non-wheeled vertical take-off and landing aircraft transfer platform is too large and the travel mode is relatively single, the present invention proposes an aircraft transport device with flexible steering and multiple travel modes, which facilitates the flexible movement of the non-wheeled vertical take-off and landing aircraft.

[0005] In order to achieve the above object, the present invention adopts the following technical solution.

[0006] First, on the one hand, the present invention provides an aircraft transport device, wherein the four corners of the transport device are provided with moving wheels, wherein the moving wheels include a steering wheel group and a universal wheel group, and the steering wheel group and the universal wheel group are provided at the diagonal positions of the transport device. The moving wheels adopt a diagonal steering wheel plus a universal wheel layout, and are flexible in steering, and can realize a variety of walking modes of the device, such as lateral movement, in-situ steering, crab walking, etc. At the same time, when the diagonal arrangement is arranged, the front and rear wheels can rotate in the opposite direction when steering to reduce the turning radius of the entire device, and are suitable for position adjustment in a narrow space.

[0007] In some embodiments, a handle is provided at one end of the transport device, and the handle includes a handle and a connecting rod. By providing the handle, it is convenient to manually control the moving direction of the device, and it is ergonomic, labor-saving and convenient.

[0008] In some embodiments, a steering wheel is provided at the connection between the transport device and the connecting rod, and the end of the connecting rod is connected to the transport device through the end face of the steering wheel, and the steering wheel can rotate synchronously when the connecting rod swings; the transport device also includes a control module and an angle sensing component, the angle sensing component is used to sense the rotation angle A1 of the steering wheel and transmit it to the control module, the control module is used to control the steering motor rotation angle A2 of at least one steering wheel in the steering wheel group according to the rotation angle of the steering wheel, and the steering motor rotation angle A2 is determined according to the rotation angle A1 of the steering wheel.

[0009] In the above scheme, the swing angle of the handle is converted into angular displacement through the steering wheel, and the angular displacement is sensed by the angle sensing component and transmitted to the control module. The control module controls the steering angle of the steering wheel according to the angular displacement of the steering wheel, thereby realizing precise control of the steering angle of the steering wheel by the steering of the handle and synchronization of the two, and realizing smooth and stepless control of the steering of the transport device.

[0010] Furthermore, the angle sensing component includes an encoder, and the encoder friction wheel of the encoder contacts the outer edge of the steering wheel, and the rotation angle A1 of the steering wheel is obtained when the steering wheel rotates. As an angle sensing component, the encoder utilizes the contact and friction between the encoder friction wheel and the steering wheel. Mechanical friction can more reliably obtain the angular displacement of the steering wheel, and convert the angular displacement of the steering wheel into an electrical signal, which is sent to the control module for identification.

[0011] In order to prevent the steering wheel angular displacement from being incorrectly acquired due to the encoder friction wheel failure, poor friction, or poor rotation, in some embodiments of the present invention, the encoder friction wheels are multiple and spaced around the steering wheel. Multiple encoder friction wheels verify and complement each other, making the acquisition result of the steering wheel angular displacement more reliable and accurate. In addition, multiple encoder friction wheels can also improve the perception sensitivity. Even if the rotation is very small, there is always an encoder friction wheel that can be captured, thereby ensuring that the steering angle of the steering wheel is highly matched with the steering angle of the handle, and improving the accuracy and flexibility of the steering control of the handling device.

[0012] In some embodiments, the steering motor of the second steering wheel is electrically connected to the steering motor of the first steering wheel, and the rotation angle of the second steering wheel is controlled according to the steering angle of the first steering wheel. The steering motors of the steering wheels of the chain are connected so that one can be used as a driving wheel and the other as a driven wheel, thereby reducing the control of one steering wheel, simplifying the algorithm and reducing resource consumption.

[0013] In some embodiments, a remote controller is further included, and the second steering wheel and / or the first steering wheel can be controlled to rotate at an angle by the remote controller. By remote control, it is possible to achieve places that are inconvenient for human body to enter, reduce the physical exertion of human body pulling, and improve the control precision and accuracy.

[0014] In some embodiments, one end of the transport device is provided with a U-shaped groove, one end face of the steering wheel is flat on the bottom of the U-shaped groove, and the other end face is connected to the connecting rod. The handle is provided with an automatic return spring, and the two ends of the automatic return spring are respectively connected to the steering wheel and the side of the U-shaped groove. When the handle deviates from the middle position, the automatic return spring pulls the handle back to the middle position to achieve automatic return. The above scheme realizes the automatic return function of the handle, satisfies the position control of the handle in a static state, and avoids the handle from swinging randomly to cause bumps during remote control operation. At the same time, it can also prevent the direction from deviating when the device is traveling in a straight line.

[0015] In some embodiments, the transport device includes a lifting surface and a receiving cavity located in the middle of the lifting surface, the receiving cavity extends from the plane where the lifting surface is located in the direction of the moving wheels and is located in the space between the moving wheels. The chassis inside the wheel train is directly lowered to save height space for installing lifting and other electrical equipment.

[0016] In some embodiments, the lifting surface is provided with a positioning block for matching with the aircraft. The positioning block can meet the combination of the aircraft within a certain range, reduce the difficulty of positioning, and avoid lifting failure in the case of left and right deviation or slight tilt between the aircraft and the handling device.

[0017] Beneficial effects of the present invention:

[0018] 1. Flexible steering, small turning radius, and multiple walking modes facilitate the position adjustment of the equipment in small places such as hangars and maintenance workshops;

[0019] 2. Intelligent wire-controlled pull rod, good reliability, simple and flexible control, and simple structure of return to center solution;

[0020] 3. The layout is compact, the lifting stroke is high and the chassis has good passability. At the same time, the enlarged rubber block facilitates visual alignment with the aircraft and reduces the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 Schematic diagram of existing handling device;

[0023] Figure 2 It is a schematic diagram of the overall structure of the transport device in Example 1 of the present invention;

[0024] Figure 3 It is another overall structural schematic diagram of the transport device in Embodiment 1 of the present invention;

[0025] Figure 4 is a detailed schematic diagram of the transport device of Example 1 of the present invention;

[0026] Figure 5 It is another detailed schematic diagram of the transport device in Embodiment 1 of the present invention;

[0027] In the figure, 1-steering wheel, 101-first steering wheel, 102-second steering wheel, 2-universal wheel, 3-handle, 301-handle, 302-connecting rod, 4-steering gear, 5-encoder friction wheel, 6-automatic return spring, 7-screw, 8-base, 9-bend part, 10-elastic connecting part, 11-first bolt, 110-second bolt, 12-U-shaped groove, 13-alignment block, 14-lifting ring, 15-lifting surface, 16-accommodating cavity, 17-scissors lifting mechanism. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0029] It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments, which also fall within the scope of protection of the present invention.

[0030] In the description of the present invention, the following terms need to be explained:

[0031] As for directional words, the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions and positional relationships in the specification and claims of this application are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and should not be understood as limiting the specific protection scope of the present invention.

[0032] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0033] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0034] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. When an element is referred to as being "provided with" another element, it may be provided on the surface or inside of the element.

[0035] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0036] The term "electrical connection" in the specification and claims of this application may refer to a circuit connection with physical contact or a communication connection, which may be a wired communication connection or a wireless communication connection.

[0037] Example 1

[0038] First, this embodiment provides an aircraft transport device, the overall structure of which is as follows: Figure 2 , Figure 3As shown, the four corners of the transport device are provided with moving wheels, and the moving wheels include a steering wheel group and a universal wheel group, and the steering wheel group and the universal wheel group are arranged at the diagonals of the transport device. The moving wheels adopt the layout of a steering wheel 1 plus a universal wheel 2. On the one hand, the steering wheel 1 can freely and actively control the steering angle, and the universal wheel 2 can achieve 360° flexible steering. A group of steering wheels 1 are set at two diagonal positions of the device, and a group of universal wheels 2 are set at the other two diagonal positions. By controlling the steering angle of the steering wheel 1, the direction of the device is controlled. During specific operations, the steering angles of the steering wheel 101 and the steering wheel 102 can be controlled separately according to the actual site and needs, or one steering wheel 101 can be controlled, and the other steering wheel 102 rotates according to the steering angle of the first steering wheel 101. In this way, when the device wants to go in a certain direction, When turning, the two steering wheels 1 are arranged diagonally, one in front and one behind. When the front steering wheel 101 turns, the rear steering wheel 102 will also turn in the opposite direction accordingly, which accelerates the turning of the device and reduces the turning radius. The universal wheels 2 located at the other two diagonals can flexibly turn 360° as the steering wheel 1 turns, making the device easier and more convenient to turn, thereby achieving flexible steering and realizing various walking modes of the device, such as lateral movement, on-the-spot turning, crab walking, etc. At the same time, when turning after the diagonal arrangement, the front and rear wheels can rotate in opposite directions to reduce the turning radius of the entire device, which is suitable for position adjustment in a small venue.

[0039] The current products of the steering part have manual steering through the handle or steering controlled by the remote control. The manual method requires a large operating force to achieve, and the remote control method is only adjusted by vision, which is prone to risks such as bumps. At the same time, in order to avoid risks, the moving speed is slow. Optionally, in order to meet the needs of human pulling, a handle 3 is provided at one end of the transport device described in this embodiment, and the handle 3 includes a handle 301 and a connecting rod 302. By setting the handle 3, it is convenient to manually control the moving direction of the device, and it is ergonomic, labor-saving and convenient. In some embodiments, the handle 3 can be integrated with function buttons such as power on, operation buttons, status display, emergency stop, gear adjustment, etc., so as to facilitate the adjustment of the state and movement parameters of the transport device. Among them, the emergency stop button can be set at the end or side of the handle 3 handle 301, and the emergency stop is directly triggered when the handle 3 is accidentally hit, or it can be actively triggered by the operator, which can be controlled by the button on the handle 3, or it can be remotely controlled. Optionally, in some embodiments, in order to facilitate operation, a remote control device displacement control method can be adopted, that is, the device also includes a remote control, and the second steering wheel and / or the first steering wheel can control the rotation angle through the remote control. Through remote control, it can achieve places that are inconvenient for human beings to enter, reduce the physical consumption of human beings pulling, and improve control precision and accuracy.

[0040] In actual operation, a steering wheel is provided at the connection between the transport device and the connecting rod 302. The edge of the steering wheel can be set in various shapes, such as a flat surface, protrusions arranged at intervals, a gear shape, or a rough surface as a whole. In this embodiment, a gear is used as the steering wheel, which is called a steering gear 4, and the end of the connecting rod 302 is connected to the transport device through the end face of the steering gear 4. Figure 4 and Figure 5 As shown, specifically, a number of matching screw holes can be drilled on the end faces of the transport device and the steering gear 4, and the connecting rod 302 can be fixed to the gear end face by means of screws 7. The end of the connecting rod 302 of the handle 3 away from the handle 301 can be arranged as a curved portion 9 with a certain curvature, and the end of the curved portion 9 is hinged to the base 8 on both sides by a penetrating first bolt 11. The hinged manner can realize that the handle 3 can rotate around the first bolt 11, and the handle 3 can be lifted up or pressed down to adapt to different usage scenarios. The bases 8 on both sides are connected to the end faces of the steering gear 4 by screws 7. In order to improve stability, a retractable connector, such as an elastic connector or a telescopic rod, is further provided on the inner side of the arc of the curved portion 9. In this embodiment, the elastic connector 10 is taken as an example. The two ends of the elastic connector 10 are respectively connected to the curved portion 9 and the base 8. Specifically, a second bolt 110 parallel to the first bolt 11 is provided on the base 8. The elastic connector 10 is connected to the second bolt 110. The elastic connector 10 can be stretched when the handle 3 is lifted up and contracted when the handle 3 is pressed down, so as to achieve free retraction and space saving, reduce the length of the fixed-length connector, and reduce the insufficient length of the connector to limit the lifting angle of the handle 3 when the handle 3 is lifted up, and reduce the redundant space occupied when the handle 3 is pressed down and easily interfere with the movement of the device, wherein the first bolt 11 and the second bolt 110 can also be bearings. When the connecting rod 302 swings, the steering gear 4 can rotate synchronously, and the swing angle of the handle 3 is converted into angular displacement through the steering gear 4.

[0041] The handling device also includes a control module and an angle sensing component, the angle sensing component is used to sense the rotation angle A1 of the steering gear 4 and transmit it to the control module, the control module is used to control the steering motor rotation angle A2 of at least one steering wheel 1 in the steering wheel group according to the rotation angle of the steering gear 4, and the steering motor rotation angle A2 is determined according to the rotation angle A1 of the steering gear 4. The steering motor rotation angle A2 is determined according to the rotation angle A1 of the steering gear 4, which means that the steering motor rotation angle A2 is calculated according to the rotation angle A1 of the steering gear 4, and the two can be the same or different, depending on actual needs. There is a correlation between the angles of the steering wheel 101 and the steering wheel 102, which can be controlled separately according to the algorithm of the control module, but the rotation angles between the two will have different correlations according to different control modes (such as lateral movement, in-situ steering or ordinary steering).

[0042] The angle sensing component can be any device that can obtain the rotation angle of the steering gear 4, and can use visual recognition technology or an angular displacement sensor. In this embodiment, an encoder is used. The angle sensing component includes an encoder, and the friction wheel of the encoder, that is, Figure 5 The encoder friction wheel 5 in the embodiment contacts the outer edge of the steering gear 4, that is, the tooth top, and obtains the rotation angle A1 of the steering gear 4 when the steering gear 4 rotates. The encoder is used as an angle sensing component. The encoder friction wheel 5 contacts and rubs with the steering gear 4. Mechanical friction can more reliably obtain the angular displacement of the steering gear 4, and convert the angular displacement of the steering gear 4 into an electrical signal, which is sent to the control module for identification. The control module controls the steering angle of the steering wheel 1 according to the angular displacement of the steering gear 4, thereby realizing the precise control of the steering angle of the steering wheel 1 by the steering of the handle 3 and the synchronization of the two, and realizing the smooth and stepless control of the steering of the handling device. It should be noted that the contact surface of the encoder friction wheel 5 of this embodiment can be a rough frosted surface, or a contact surface with various patterns to enhance friction. This embodiment adopts an encoder friction wheel 5 with closely arranged horizontal stripes, that is, the contact surface of the encoder friction wheel 5 is provided with closely arranged horizontal stripes, and the direction of the horizontal stripes is parallel to the axis of the encoder friction wheel 5.

[0043] The control module can control the steering angle of the steering wheel 101 adjacent to the handle 3, or control the steering angles of the two steering wheels 1 at the same time. The steering directions and angles of the two steering wheels 1 can be the same or different, or a linkage method can be adopted, for example, the steering motor of the second steering wheel is electrically connected to the steering motor of the first steering wheel, and the rotation angle of the second steering wheel is controlled according to the steering angle of the first steering wheel. The steering motors of the steering wheels of the chain are connected, so that one can be used as a driving wheel and the other as a driven wheel, thereby reducing the control of one steering wheel 1, simplifying the algorithm and reducing resource consumption.

[0044] In order to prevent the encoder friction wheel 5 from malfunctioning, causing poor friction or poor rotation, etc., which may cause the steering gear 4 angular displacement to be incorrectly acquired, optionally, in some embodiments of the present invention, the encoder friction wheel 5 is multiple and spaced around the steering gear 4. Multiple encoder friction wheels 5 verify and complement each other, making the acquisition result of the steering gear 4 angular displacement more reliable and accurate. In addition, multiple encoder friction wheels 5 can also improve the perception sensitivity. Even if the rotation is very small, there is always an encoder friction wheel 5 that can be captured, thereby ensuring that the steering angle of the steering wheel 1 is highly matched with the steering angle of the handle 3, and improving the accuracy and flexibility of the steering control of the transport device.

[0045] The handle 3 of the transport device of this embodiment also has an automatic return to center function. One end of the transport device is provided with a U-shaped groove 12. One end face of the steering gear 4 is flatly arranged at the bottom of the groove of the U-shaped groove 12, and the other end face is connected to the connecting rod 302. The handle 3 is provided with an automatic return to center spring 6. The two ends of the automatic return to center spring 6 are respectively connected to the steering gear 4 and the side of the U-shaped groove. When the handle 3 deviates from the middle position, the automatic return to center spring 6 pulls the handle 3 back to the middle position to achieve automatic return to center. In practical applications, the automatic return to center spring 6 can also be set on only one side, or on both sides of the U-shaped groove 12, or in multiple places according to needs. In this embodiment, the automatic return to center spring 6 is set on the two sides opposite to the steering gear 4 and the U-shaped groove 12. The automatic return to center function of the handle 3 is achieved through the above scheme, which satisfies the position control of the handle 3 in a static state, and prevents the handle 3 from swinging randomly and causing bumps during remote control operation. At the same time, it can also prevent the direction from deviating when the device is traveling in a straight line.

[0046] Because aircraft sometimes face scenes in narrow spaces, the center of gravity of the aircraft needs to be lowered for stability. Therefore, the height of the landing gear is relatively low from the ground, and the height of the handling platform is required to be as low as possible. At the same time, sufficient lifting height must be met to prevent the aircraft from rubbing against the ground or ground obstacles during transportation, and a certain passability must be guaranteed. Therefore, the lifting, drive, control, power supply and other modules need to be integrated in a limited space, and in order to facilitate alignment with the aircraft, sufficient margin should be left at the lifting joint as much as possible to avoid excessive operation difficulty or alignment failure.

[0047] Based on the above requirements, the structural design of the transport device of this embodiment adopts a design of lowering the chassis. The device includes a lifting surface 15 and a receiving chamber 16 located in the middle of the lifting surface 15. The lifting surface 15 is symmetrically arranged on both sides of the receiving chamber 16. A scissor lifting mechanism 17 is used below the lifting surface 15 to complete the lifting function. The receiving chamber 16 extends from the plane where the lifting surface 15 is located in the direction of the moving wheel and is located in the space between the moving wheels. In this way, the lifting stroke of the device can be large compared to the vehicle body height, and the layout is compact. While improving the lifting stroke, the inner chassis of the wheel system can also be directly lowered to save height space for installing lifting equipment and other electrical equipment. Lifting rings 14 can be set at the four corners of the device to further increase the height of the device when the lifting height of the device is insufficient. In some special occasions where the lifting height is extremely high, or when the moving wheel of the device fails or the road surface is not suitable for the operation of the moving wheel, the lifting ring 14 can also be used to move the device.

[0048] In order to facilitate accurate alignment when the aircraft is landed or placed, and to improve the safety and stability of the aircraft during transportation, the lifting surface 15 described in this embodiment is provided with an alignment block 13 for matching with the aircraft. The alignment block 13 can meet the combination of the aircraft within a certain range, reduce the difficulty of alignment, and avoid lifting failure in the case of left and right front and back offsets, slippage, or slight inclination between the aircraft and the handling device. The alignment block 13 can be made of elastic material, such as a rubber pad, to protect the aircraft from damage, and at the same time have a certain fault tolerance for alignment work, and small errors can be overcome by the deformation of the elastic rubber pad.

[0049] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aircraft transport device, wherein the four corners of the transport device are provided with moving wheels, characterized in that: The moving wheels include a steering wheel group and a universal wheel group, and the steering wheel group and the universal wheel group are arranged at opposite corners of the transport device.

2. The transport device according to claim 1, characterized in that: A handle is provided at one end of the carrying device, and the handle comprises a handle and a connecting rod.

3. The transport device according to claim 2, characterized in that: A steering wheel is provided at the connection between the transport device and the connecting rod, and the end of the connecting rod is connected to the transport device through the end surface of the steering wheel. When the connecting rod swings, the steering wheel can rotate synchronously; The carrying device also includes a control module and an angle sensing component, wherein the angle sensing component is used to sense the rotation angle A1 of the steering wheel and transmit it to the control module, and the control module is used to control the steering motor rotation angle A2 of at least one steering wheel in the steering wheel group according to the rotation angle of the steering wheel, and the steering motor rotation angle A2 is determined according to the rotation angle A1 of the steering wheel.

4. The transport device according to claim 3, characterized in that: The angle sensing component includes an encoder, an encoder friction wheel of the encoder contacts the outer edge of the steering wheel, and a rotation angle A1 of the steering wheel is obtained when the steering wheel rotates.

5. The transport device according to claim 4, characterized in that: The encoder friction wheels are multiple and are distributed at intervals around the steering wheel.

6. The transport device according to claim 2, characterized in that: The steering wheel assembly includes a first steering wheel and a second steering wheel. The steering motor of the second steering wheel is electrically connected to the steering motor of the first steering wheel, and the rotation angle of the second steering wheel is controlled according to the steering angle of the first steering wheel.

7. The transport device according to claim 5 or 6, characterized in that: A remote controller is also included, and the second steering wheel and / or the first steering wheel can be controlled to rotate at an angle via the remote controller.

8. The transport device according to claim 7, characterized in that: A U-shaped groove is provided at one end of the carrying device, one end face of the steering wheel is flat on the bottom of the U-shaped groove, and the other end face is connected to the connecting rod. The handle is provided with an automatic return spring, and the two ends of the automatic return spring are respectively connected to the steering wheel and the side of the U-shaped groove. When the handle deviates from the middle position, the automatic return spring pulls the handle back to the middle position to achieve automatic return.

9. The transport device according to claim 8, characterized in that: The transport device comprises a lifting surface and a receiving cavity located in the middle of the lifting surface. The receiving cavity extends from the plane where the lifting surface is located toward the direction of the moving wheels and is located in the space between the moving wheels.

10. The transport device according to claim 9, characterized in that: The lifting surface is provided with a positioning block for matching with the aircraft.

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