Liftable unmanned aerial vehicle fuselage transportation device and loading method thereof

Abstract

The invention discloses a liftable unmanned aerial vehicle fuselage transportation device and a loading method thereof, and relates to the field of unmanned aerial vehicle transportation equipment, the liftable unmanned aerial vehicle fuselage transportation device comprises a transportation bracket which comprises a front bracket and a rear bracket, the front bracket and the rear bracket are detachably connected, and upper-layer frames are arranged on the front bracket and the rear bracket respectively; the upper-layer frame supports a fuselage of the unmanned aerial vehicle through a bracket supporting mechanism, an annular steel wire shock absorber is arranged at the bottom of the upper-layer frame, and a fuselage lifting mechanism is further arranged between the upper-layer frame and the fuselage of the unmanned aerial vehicle; the transportation box is used for containing the transportation bracket, a guide rail and a traction mechanism are arranged in the transportation box, the traction mechanism is connected with the transportation bracket, and the transportation bracket moves along the guide rail when the traction mechanism is connected with the transportation bracket; a plurality of pairs of universal wheels are arranged on the transportation bracket in the length direction, and the universal wheels are connected with the transportation bracket through a bracket lifting mechanism; according to the transportation device, lifting, transferring and storing of the unmanned aerial vehicle body are achieved through a reasonable mechanical structure and electric appliance control.

Description

Technical Field

[0001] The present invention belongs to the field of unmanned aerial vehicle transportation equipment, and more specifically, relates to a liftable unmanned aerial vehicle fuselage transportation device and an installation method thereof. Background Art

[0002] At present, medium and large drones have a wide application market, but due to airspace safety issues, they cannot transfer themselves like manned aircraft except for performing work tasks. They must be transferred and transported by special transportation devices. Traditional transportation devices generally need to use a jacking device to lift the fuselage and retract the landing gear, and then hoist the aircraft onto the transport bracket through a sling. The transport bracket enters and exits the packaging box by pushing the bracket into the box through a ramp, which requires a lot of manpower, and there is a risk of the transport frame tilting and the tilted part of the transport frame suddenly falling when pushing it in through the ramp. In the specific use process, there are still many shortcomings, which are mainly manifested in the following points:

[0003] First, a variety of support equipment is required to complete the transfer of the drone body during the transfer process;

[0004] Second, aircraft lifting and crating transfer require a lot of manpower and time;

[0005] Third, the general transfer bracket has fewer support points, cannot support the frame plate at multiple points, and has support point height or shape errors;

[0006] Fourth, the general transport bracket has a poor shock absorption effect, which may cause damage to the aircraft structure under relatively severe road conditions. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies in the prior art and provide a liftable UAV fuselage transport device and an installation method thereof. The transport device realizes the lifting, transportation and storage of the UAV fuselage through a reasonable mechanical structure and electrical control.

[0008] In order to achieve the above object, the present invention provides a liftable UAV fuselage transport device, comprising:

[0009] A transport bracket, comprising a front bracket and a rear bracket, wherein the front bracket and the rear bracket are detachably connected, and an upper frame is respectively provided on the front bracket and the rear bracket, wherein the upper frame supports the fuselage of the UAV through a bracket support mechanism, an annular steel wire shock absorber is provided at the bottom of the upper frame, and a fuselage lifting mechanism is also provided between the upper frame and the fuselage of the UAV;

[0010] A transport box, used for placing the transport bracket, wherein a guide rail and a traction mechanism are arranged in the transport box, wherein the traction mechanism is connected to the transport bracket and enables the transport bracket to move along the guide rail;

[0011] The transport bracket is provided with a plurality of pairs of universal wheels along the length direction, and the universal wheels are connected to the transport bracket via a bracket lifting mechanism.

[0012] Optionally, the front bracket and the rear bracket are connected via a docking flange.

[0013] Optionally, the fuselage lifting mechanism is a pair of worm gear lifts, which are respectively arranged on both sides of the transport bracket, and the bracket support mechanism is arranged between the two worm gear lifts. The output end of the worm gear lift is connected to the bracket support mechanism, and multiple pairs of guide rods are also arranged on the upper frame, and the guide rods cooperate with the fuselage of the drone.

[0014] Optionally, the bracket support mechanism includes a support frame, which is a metal frame, and the top surface of the metal frame is sequentially provided with a nylon conformal plate, a rubber pad and a felt sheet, the metal frame and the nylon conformal plate are detachably connected, and a plurality of pads are provided between the metal frame and the nylon conformal plate.

[0015] Optionally, a plurality of pairs of fixed lifting rings are provided on the upper frame, and each pair of the fixed lifting rings are connected by fuselage straps, and the fuselage straps are used to bind the fuselage of the drone.

[0016] Optionally, a fixing tool is further provided above the upper frame, and the upper frame and the fixing tool are connected by the binding belt.

[0017] Optionally, a mobile power source is provided on the transport bracket, and the mobile power source is connected to a plurality of power supply sockets via a switching cable.

[0018] Optionally, a pair of guide rails are provided in the transport box, the traction mechanism includes an explosion-proof distribution box arranged between the guide rails, the mobile power supply is detachably connected to the explosion-proof distribution box, each guide rail is correspondingly provided with a winch bracket, the winch bracket is connected to the motor drive, the mobile power supply is electrically connected to the motor, and the winch bracket is used to tow the transport bracket through a cable and a hook.

[0019] Optionally, a block is provided on the guide rail, the block is connected to the front and rear ends of the transport bracket, and a fire extinguisher is provided in the transport box.

[0020] The present invention also provides a method for installing a liftable UAV fuselage transport device, using the liftable UAV fuselage transport device, the method comprises:

[0021] When the transport bracket moves into the transport box, the pair of universal wheels close to one end of the transport box is lifted by the lifting mechanism. When the universal wheels are higher than the bottom of the transport box, the transport bracket is moved into the transport box by the other universal wheels. If any pair of universal wheels interferes with the bottom of the transport box, the lifting mechanism is adjusted in the above manner.

[0022] When the universal wheel contacts the guide rail, the traction mechanism is connected to the transport bracket, and the transport bracket is driven to move into the transport box by the traction mechanism.

[0023] The present invention provides a liftable UAV fuselage transport device and an installation method thereof, which has the beneficial effects that: when the transport bracket in the transport device supports the UAV fuselage, the front bracket and the rear bracket are respectively inserted into the bottom of the fuselage from the front end and the rear end of the UAV fuselage, so that the front landing gear of the UAV can be avoided, and then the front and rear brackets are connected through a docking flange, and the support frame is driven to move upward by the fuselage lifting mechanism, so that the UAV fuselage is lifted off the ground, and then the UAV is fixed to the transport bracket by the fuselage strap, and finally the transport bracket is moved into the transport box, when the universal wheel interferes with the bottom step of the transport box, the universal wheel is driven to be lifted by the bracket lifting mechanism to achieve avoidance, and the transport bracket continues to slide into the transport box by the universal wheels fixed at other positions, so that the transport bracket successfully enters the transport box.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0026] Figure 1 A schematic diagram of the internal structure of a transport box according to an embodiment of the present invention is shown.

[0027] Figure 2 A structural schematic diagram of a traction mechanism according to an embodiment of the present invention is shown.

[0028] Figure 3 A schematic structural diagram of a transport bracket according to an embodiment of the present invention is shown.

[0029] Figure 4 Shows Figure 3 A partial schematic diagram of .

[0030] Description of reference numerals:

[0031] 1. Electric winch; 2. Explosion-proof distribution box; 3. Transport box; 4. Fire extinguisher; 5. Guide rail; 6. Hook; 7. Motor; 8. Coupling; 9. Directional wheel; 10. Winch bracket; 11. Wire trough; 12. Handle; 13. Winch; 14. Front bracket; 15. Block; 16. Fuselage lifting mechanism; 17. Bracket lifting mechanism; 18. Fixed lifting ring; 19. Rear bracket; 20. Upper frame; 21. Ring steel wire shock absorber; 22. Metal frame; 23. First five-hole socket; 24. Universal wheel; 25. Binding belt; 26. Docking flange; 27. Fixed tooling; 28. Nylon conformal plate; 29. ​​Mobile power supply; 30. Adapter cable; 31. Second five-hole socket; 32. Connecting rod; 33. Guide rod; 34. Worm gear lift; 35. Tool box. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] The present invention provides a transport device for a liftable UAV fuselage, comprising:

[0034] The transport bracket includes a front bracket and a rear bracket, the front bracket and the rear bracket are detachably connected, and an upper frame is respectively provided on the front bracket and the rear bracket, and the upper frame supports the fuselage of the UAV through a bracket support mechanism, and an annular steel wire shock absorber is provided at the bottom of the upper frame, and a fuselage lifting mechanism is also provided between the upper frame and the fuselage of the UAV;

[0035] The transport box is used to place the transport bracket. A guide rail and a traction mechanism are arranged in the transport box. The traction mechanism is connected to the transport bracket and enables the transport bracket to move along the guide rail.

[0036] The transport bracket is provided with a plurality of pairs of universal wheels along the length direction, and the universal wheels are connected to the transport bracket through a bracket lifting mechanism.

[0037] Specifically, the transport device includes a transport bracket and a transport box. The transport bracket is in direct contact with the drone body. The drone body can be supported by the bracket support mechanism of the upper frame, and the drone body can be lifted off the ground by driving the bracket support mechanism through the fuselage lifting mechanism. The annular steel wire shock absorber arranged between the upper frame and the front and rear brackets can reduce the damage to the drone caused by severe road conditions during the transportation of the drone. A bracket lifting mechanism is also arranged on the lower side of the front and rear brackets, and the bracket lifting mechanism drives multiple pairs of universal wheels to be lifted in turn, so that the transport bracket can successfully enter the transport box. With the cooperation of the traction mechanism and the guide rail, the transport bracket can be transferred along the correct trajectory to the specified position of the transport box, so that the drone body can be fixed in the transport box without manual operation, thus saving a lot of packing time.

[0038] Optionally, the front bracket and the rear bracket are connected via a butt flange.

[0039] Specifically, the transport bracket is designed to be composed of two parts: a front bracket and a rear bracket. The front bracket is inserted from the front end of the fuselage into the bottom of the fuselage, and the rear bracket is inserted from the rear end of the fuselage into the bottom of the fuselage. The rear bracket can pass between the two rear wheels of the UAV, and the front and rear brackets are combined at the periphery of the front wheels of the UAV to form a complete transport bracket frame. The front and rear brackets are fixedly connected by docking flanges, so that it is convenient to support the entire bottom of the fuselage of the UAV over a larger area through the transport bracket. There is no need to use a transport bracket of a corresponding size for a certain size and model of UAV, which improves the applicability of the transport bracket. When installing the transport bracket, the wheels of the nose can also be avoided to improve the installation efficiency.

[0040] Optionally, the fuselage lifting mechanism is a pair of worm gear elevators, which are respectively arranged on both sides of the transport bracket, and a bracket support mechanism is arranged between the two worm gear elevators. The output ends of the worm gear elevators are connected to the bracket support mechanism, and multiple pairs of guide rods are also arranged on the upper frame, which cooperate with the fuselage of the UAV.

[0041] Specifically, a plurality of mutually parallel fuselage lifting mechanisms are arranged on the upper frame, and a pair of worm gear lifts are adopted as a fuselage lifting mechanism. The two worm gear lifts are respectively arranged at the two ends of the bracket support mechanism, and the turbines at the two ends are driven to rotate synchronously by a connecting rod, so that the worm gears at the two ends move upward synchronously, thereby driving the bracket support mechanism to move upward, and lifting the UAV fuselage, which is convenient for the transportation of the UAV; a plurality of pairs of guide rods are also arranged between the plurality of fuselage lifting mechanisms, and the guide rods are also located on both sides of the bracket support mechanism, so that the space between each pair of guide rods is aligned with the UAV fuselage, which is convenient for aiming and positioning the bracket support mechanism and the UAV fuselage.

[0042] Optionally, the bracket support mechanism includes a support frame, which is a metal frame. The top surface of the metal frame is sequentially provided with a nylon conformal plate, a rubber pad and a felt sheet. The metal frame and the nylon conformal plate are detachably connected, and multiple pads are provided between the metal frame and the nylon conformal plate.

[0043] Specifically, the transport device sets nylon conformable plates of different sizes on each support frame, and replaces different types of nylon conformable plates according to the specific size of the UAV fuselage, so that the bracket support mechanism can fit perfectly with the UAV fuselage to ensure stable support for the UAV; after selecting the corresponding nylon conformable plate, rubber pads and felt sheets are laid on the plate, so as to prevent the nylon conformable plate from causing bumps on the fuselage during the transportation of the UAV.

[0044] Optionally, a plurality of pairs of fixed lifting rings are provided on the upper frame, and each pair of fixed lifting rings are connected by fuselage straps, and the fuselage straps are used to bind the fuselage of the drone.

[0045] Optionally, a fixing tool is further provided above the upper frame, and the upper frame and the fixing tool are connected with a binding belt.

[0046] Specifically, after the drone body is lifted by the bracket support mechanism, the drone can be tied and fixed by straps, and the straps are connected to the fixed lifting rings, so that the fuselage can be firmly connected to the upper frame.

[0047] Optionally, the transport bracket is provided with a plurality of pairs of universal wheels along the length direction, and the universal wheels are connected to the transport bracket via a bracket lifting mechanism.

[0048] Specifically, multiple pairs of universal wheels are arranged at the bottom of the front and rear brackets to facilitate the front and rear brackets to slide into the bottom of the drone; in addition, after the drone fuselage is fixed to the upper frame, the transport bracket is transferred into the transport box, and six pairs of universal wheels are arranged on the transport bracket, of which the second pair and the fifth pair of universal wheels are connected to the transport bracket through a bracket lifting mechanism. The height of the transport bracket is first increased by the bracket lifting mechanism. At this time, the transport bracket is supported only by the two pairs of universal wheels connected to the bracket lifting mechanism, so that the universal wheels that are about to enter the fixed height of the transport box will also be lifted, and the lifted universal wheels are higher than the bottom surface of the transport box. It is best to align the lifted universal wheels with the slide rails The transport bracket is slid into the transport box through the universal wheels connected to the bracket lifting mechanism. When the lifted universal wheels slide in contact with the slide rails, part of the weight of the transport bracket is transferred to the slide rails through the universal wheels entering the transport box. As the transport bracket enters the transport box, the second pair of universal wheels is lifted by the bracket lifting mechanism. In this way, the universal wheels avoid the bottom of the transport box, and there is no need to enter the transport box through a ramp, avoiding the risk of the transport bracket tilting and the tilted part suddenly falling. When the fifth pair of universal wheels is about to enter the transport box, the universal wheels are lifted by the bracket lifting mechanism, and finally the entire transport bracket enters the transport box.

[0049] Optionally, a mobile power supply is provided on the transport bracket, and the mobile power supply is connected to a plurality of power supply sockets via a switching cable.

[0050] Specifically, when driving the bracket support mechanism to lift the drone body and drive the universal wheels to lift, electric drive is required. A mobile power supply is arranged on the transport bracket to conveniently power the transport device.

[0051] Optionally, a pair of guide rails are provided in the transport box, the traction mechanism includes an explosion-proof distribution box arranged between the guide rails, the mobile power supply is detachably connected to the explosion-proof distribution box, each guide rail is correspondingly provided with a winch bracket, the winch bracket is connected to the motor drive, the mobile power supply is electrically connected to the motor, and the winch bracket is used for towing the transport bracket through a cable and a hook.

[0052] Specifically, after the transport bracket enters the transport box, the mobile power supply on the transport bracket can be transferred to the explosion-proof distribution box, and the motor is driven by the mobile power supply. The motor drives the cable on the winch bracket to pull the transport bracket to continue sliding along the guide rail until it moves to the designated position in the transport box.

[0053] Optionally, a block is provided on the guide rail, the block is connected to the front and rear ends of the transport bracket, and a fire extinguisher is provided in the transport box.

[0054] Specifically, in order to prevent the mobile power supply from catching fire in the transport box, a fire extinguisher is also installed in the transport box to ensure the safe transportation of the UAV and the transport device; when the transport bracket carrying the UAV body moves to the specified position of the slide rail, it can be connected and fixed to the ends of the front and rear brackets through blocks to ensure that the UAV body will not shake during transportation.

[0055] The present invention also provides a method for installing a liftable UAV fuselage transport device, using the liftable UAV fuselage transport device, the method comprises:

[0056] When the transport bracket moves into the transport box, a pair of universal wheels near one end of the transport box is lifted up by the lifting mechanism, so that the universal wheels are higher than the bottom of the transport box, and then the transport bracket is moved into the transport box by the other universal wheels. If any pair of universal wheels interferes with the bottom of the transport box, the lifting mechanism is adjusted in the above manner;

[0057] When the universal wheel contacts the guide rail, the traction mechanism is connected to the transport bracket, and the transport bracket is driven to move into the transport box through the traction mechanism.

[0058] Example

[0059] like Figures 1 to 4As shown, the present invention provides a transport device for a liftable UAV fuselage, which includes a transport box 3 and a transport bracket, wherein the transport bracket is a front and rear split structure, consisting of a front bracket 14 and a rear bracket 19, and upper frames 20 are respectively provided on the front and rear brackets. When the transport bracket needs to be extended into the lower part of the UAV fuselage, the front bracket 14 and the rear bracket 19 need to be inserted from the front and rear ends of the UAV fuselage, respectively, so that avoidance with the front landing gear of the UAV can be achieved. After the front and rear brackets are moved into place, the two are fixed by a docking flange 26, and the corresponding nylon conformable plate 28 is selected according to the model of the UAV and installed on the metal frame 22. When the fuselage lifting mechanism 16 drives the nylon conformable plate 28 to rise, it can completely fit with the lower side of the drone fuselage. As the drone is slowly lifted off the ground, a fixing tool 27 can be placed on the top of the drone fuselage, and the fixing tool 27 and the fixing ring 18 are connected by the strap 25 to achieve the tying and fixing of the drone, so that the drone fuselage is firmly connected to the upper frame 20; next, the transport bracket is moved to the entrance of the transport box 3, and the distance between the universal wheels 24 in the second pair and the fifth pair and the transport bracket is increased by the bracket lifting mechanism 17, so that the universal wheels 24 at the front end with a fixed height are lifted together with the transport bracket, When the transport bracket is higher than the bottom platform of the transport box 3, the second pair and the fifth pair of universal wheels 24 are used to push the transport bracket toward the transport box 3. When the transport bracket gradually enters the transport box 3, the second pair and the fifth pair of universal wheels 24 are successively recovered, so that the universal wheels 24 that can be raised and lowered also avoid the transport box 3. The universal wheels 24 that enter the transport box 3 all roll and fit with the guide rails 5 until the entire transport bracket is completely inside the transport box 3. At this time, the mobile power supply 29 can be placed in the explosion-proof distribution box 2, and the mobile power supply 29 supplies power to the motor 7 through the wire trough 11, thereby driving the electric winch 1 to rotate, and the motor 7 and the electric winch 1 are connected. A coupling 8 is provided to ensure stable power output, and the cable is wound around the directional wheel 9 installed on the winch bracket 10, so that the hook 6 can be driven to move the transport bracket to the specified position in the transport box 3. When the transport bracket slides into place, the block 15 on the guide rail 5 is connected to the fixing holes of the front and rear brackets to ensure that the transport bracket will not be displaced in the transport box 3 during transportation; if the mobile power supply 29 cannot provide power to the motor, the handle 12 can be used to drive the winch 13 to rotate, so that the transport bracket can also be towed by the cable; in addition, in order to ensure the safety of the drone in the transport box 3, a fire extinguisher 4 is also provided.

[0060] When the UAV fuselage is fixed on the transport bracket, the annular steel wire shock absorber 21 between the front and rear brackets and the upper frame 20 can buffer the vibration of the UAV fuselage from the ground; in addition to being able to tow the transport bracket, when the UAV is lifted, the mobile power supply 29 is placed on the transport bracket and connected to the fuselage lifting mechanism 16 through the adapter cable 30, so that the bracket support mechanism can slowly lift the UAV fuselage, and through the guide rod 33 on the upper frame 20, it is also convenient to align the nylon conformable plate 28 with the UAV fuselage, and the connecting rod 32 ensures that the worm gear elevators 34 on both sides can be raised synchronously to ensure that the UAV fuselage can always remain stable; in the process of transferring the UAV fuselage to the transport device, the tools used are placed in the tool box 35 for the convenience of workers, and the transport bracket is also provided with a first five-hole socket 23 and a second five-hole socket 31, which is convenient for electricity use when the UAV fuselage and the transport bracket are supported and fixed.

[0061] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A transport device for a liftable UAV fuselage, characterized in that: include: A transport bracket, comprising a front bracket and a rear bracket, wherein the front bracket and the rear bracket are detachably connected, and an upper frame is respectively provided on the front bracket and the rear bracket, wherein the upper frame supports the fuselage of the UAV through a bracket support mechanism, an annular steel wire shock absorber is provided at the bottom of the upper frame, and a fuselage lifting mechanism is also provided between the upper frame and the fuselage of the UAV; A transport box, used for placing the transport bracket, wherein a guide rail and a traction mechanism are arranged in the transport box, wherein the traction mechanism is connected to the transport bracket and enables the transport bracket to move along the guide rail; The transport bracket is provided with a plurality of pairs of universal wheels along the length direction, and the universal wheels are connected to the transport bracket via a bracket lifting mechanism.

2. The liftable UAV fuselage transport device according to claim 1, characterized in that: The front bracket and the rear bracket are connected via a butt flange.

3. The liftable UAV fuselage transport device according to claim 1, characterized in that: The fuselage lifting mechanism is a pair of worm gear lifts, which are respectively arranged on both sides of the transport bracket, and the bracket support mechanism is arranged between the two worm gear lifts. The output end of the worm gear lift is connected to the bracket support mechanism, and multiple pairs of guide rods are also arranged on the upper frame, and the guide rods cooperate with the fuselage of the drone.

4. The liftable UAV fuselage transport device according to claim 3, characterized in that: The bracket support mechanism includes a support frame, which is a metal frame. A nylon conformal plate, a rubber pad and a felt sheet are sequentially arranged on the top surface of the metal frame. The metal frame and the nylon conformal plate are detachably connected, and a plurality of pads are arranged between the metal frame and the nylon conformal plate.

5. The liftable UAV fuselage transport device according to claim 1, characterized in that: The upper frame is provided with a plurality of pairs of fixed lifting rings, each pair of the fixed lifting rings is connected by a fuselage strap, and the fuselage strap is used to bind the fuselage of the UAV.

6. The liftable UAV fuselage transport device according to claim 5, characterized in that: A fixing tool is also arranged above the upper frame, and the upper frame and the fixing tool are connected by the binding belt.

7. The liftable UAV fuselage transport device according to claim 1, characterized in that: A stopper is arranged on the guide rail, and the stopper is connected to the front and rear ends of the transport bracket, and a fire extinguisher is arranged in the transport box.

8. The liftable UAV fuselage transport device according to claim 1, characterized in that: The transport bracket is provided with a mobile power source, and the mobile power source is connected to a plurality of power supply sockets via a switching cable.

9. The liftable UAV fuselage transport device according to claim 8, characterized in that: A pair of guide rails are arranged in the transport box, the traction mechanism includes an explosion-proof distribution box arranged between the guide rails, the mobile power supply is detachably connected to the explosion-proof distribution box, each guide rail is correspondingly provided with a winch bracket, the winch bracket is connected to the motor drive, the mobile power supply is electrically connected to the motor, and the winch bracket is used to tow the transport bracket through a cable and a hook.

10. A method for installing a liftable UAV fuselage transport device, using the liftable UAV fuselage transport device according to any one of claims 1 to 9, characterized in that: The installation method includes: When the transport bracket moves into the transport box, the pair of universal wheels close to one end of the transport box is lifted by the lifting mechanism. When the universal wheels are higher than the bottom of the transport box, the transport bracket is moved into the transport box by the other universal wheels. If any pair of universal wheels interferes with the bottom of the transport box, the lifting mechanism is adjusted in the above manner. When the universal wheel contacts the guide rail, the traction mechanism is connected to the transport bracket, and the transport bracket is driven to move into the transport box by the traction mechanism.

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