Freight unmanned aerial vehicle quick loading and unloading device

Abstract

The invention discloses a freight unmanned aerial vehicle quick loading and unloading device and belongs to the field of unmanned aerial vehicle body structures. The device comprises a tray assembly and sliding rail beam assemblies, the two sliding rail beam assemblies are arranged on a lower frame of the unmanned aerial vehicle cargo hold in parallel, and the tray assembly is horizontally installed on the two sliding rail beam assemblies in a sliding mode and used for bearing cargoes. The sliding rail beam assembly comprises a sliding rail beam and a roller assembly, the bottom of the sliding rail beam is fixedly connected with a frame beam of the lower frame, and a dovetail groove is formed in the upper end of the sliding rail beam and used for being in sliding fit with a dovetail sliding rail of the tray assembly. The roller assembly is installed on one side of the dovetail groove in parallel and used for reducing sliding friction force between the dovetail sliding rail and the sliding rail beam. The front limiting beam, the pull ring support and the rear limiting support are arranged on the periphery of the tray assembly in a matched mode, and fixing and limiting of the container are facilitated. The pallet assembly is simple in structure and light in weight, effectively saves cargo space, can easily push cargos placed on the pallet assembly to be loaded outside a cargo hold, saves manpower, and facilitates fast loading and unloading of the cargos and limiting and fixing in the cargo hold.

Description

Technical Field

[0001] The invention belongs to the field of unmanned aerial vehicle body structures, and in particular relates to a rapid loading and unloading device for a cargo unmanned aerial vehicle. Background Art

[0002] Cargo drones are mainly used for cargo transportation. They are efficient, low-cost and flexible, and are widely used in logistics, express delivery, agriculture and other fields. The cargo compartment loading and transportation design of cargo drones is often based on multiple standard size cargo boxes. For small and medium-sized cargo drones with a maximum transportation capacity of 500-1000kg, the available loading space section of the cargo compartment is often less than 1m×1m, which means that workers can only crawl or kneel when entering the cargo compartment to load and unload goods. It is difficult to install and disassemble cargo. Multiple cargo boxes result in long operation time and poor operator comfort.

[0003] In order to avoid workers entering the cabin to load and unload goods and reduce labor intensity, some small and medium-sized drones use pallet transportation, fixing the cargo box on the pallet and pushing it into the drone fuselage cargo hold. Traditional pallet transportation takes into account convenient transportation and single / double-person operation. Generally, 2-3 pallets are arranged in the cargo hold. The pallets are mostly made of aluminum alloy integrally machined frame structure with panels, or square steel and steel plate welded. The overall height is generally 30-40mm and the weight is heavy. In order to facilitate the movement of pallets and reduce friction, the traditional pallet transportation method has two sets of roller assemblies fixedly installed on the longitudinal and transverse floor frame composed of the partition frame and longitudinal beams in the cargo hold and the body, and the pallet is placed on the rollers for movement. The arrangement of the rollers will occupy part of the cargo hold loading space, and because the roller mounting grooves in the roller assemblies are mostly integral structural parts and cannot be removed from the body, when the rollers are damaged, maintenance personnel need to enter the cargo hold for maintenance, which is inconvenient. At the same time, in order to prevent the pallet from deviating and damaging the body structure during transportation, the structure also needs to arrange two sets of card slots above the longitudinal and transverse floor frames on the left and right sides of the cargo hold to fix the left and right sides of the pallet. When transporting the pallet, the left and right ends of the pallet with the cargo box fixed need to be installed into the card slots on both sides and pushed into the drone cargo hold. The card slots on both sides are prone to getting stuck during the transportation of the cargo into the hold. If rollers are provided in the card slots on both sides to avoid getting stuck, it will not only occupy part of the loading space in the cargo hold, but also increase the weight. Therefore, the existing pallet transportation form has a complex structure, is heavy, occupies a lot of space in the drone cargo hold, and its wearing parts are inconvenient to repair. Summary of the invention

[0004] Technical issues to be solved:

[0005] In order to avoid the shortcomings of the prior art, the present invention provides a rapid loading and unloading device for a cargo drone, in which a slide rail beam is embedded and installed on the lower frame of the drone cargo hold, and slidably cooperates with the dovetail slide rail at the bottom of the pallet assembly, and reduces the sliding friction between the pallet assembly and the slide rail beam by embedding a roller assembly installed on the slide rail beam, thereby effectively saving cargo hold space. The cargo placed on the pallet assembly can be easily pushed for loading outside the cargo hold, saving manpower and facilitating rapid loading and unloading of cargo and limiting and fixing in the hold.

[0006] The technical solution of the present invention is: a rapid loading and unloading device for a cargo drone, comprising a tray assembly and a slide rail beam assembly; the slide rail beam assembly is provided with two groups, which are arranged in parallel and installed on the lower frame of the drone cargo compartment along the axial direction of the drone; the tray assembly is horizontally slidably installed on the two groups of slide rail beam assemblies for carrying cargo;

[0007] The slide rail beam assembly includes a slide rail beam and a roller assembly; the slide rail beam is horizontally arranged, the bottom of which is fixedly connected to the frame beam of the lower frame, and the upper end of which is provided with a dovetail groove for cooperating with the dovetail slide rail of the tray assembly; the roller assembly is parallelly installed on one side of the dovetail groove, for reducing the sliding friction between the dovetail slide rail and the slide rail beam;

[0008] The pallet assembly includes a panel, a frame plate and a dovetail slide rail; the frame plate is a criss-cross frame plate structure, the upper end surface of which is fully paved with a panel, the frame plate is fixedly connected to the panel, and the panel is used to place goods; the dovetail slide rails are provided with two, forming two parallel beams of the frame plate, and the two dovetail slide rails are arranged corresponding to the two slide rail beams; the mounting plate at the upper end of the dovetail slide rail is fixedly connected to the frame plate of the frame plate on the corresponding side, and the dovetail portion at the lower end of the dovetail slide rail is embedded in the dovetail groove of the corresponding slide rail beam and slides with it.

[0009] A further technical solution of the present invention is: the slide rail beam is horizontally overlapped on multiple frame beams of the lower frame, the upper edge strip of the slide rail beam is in surface contact with the inner edge strip of the frame beam of the lower frame, and the two webs of the slide rail beam are provided with disconnect grooves at each frame beam of the lower frame for avoiding the frame beam of the lower frame; a first installation groove opening downward is formed between the two webs of the slide rail beam, and a connecting piece is embedded and installed in the first installation groove for fixedly connecting the slide rail beam and the frame beam of the lower frame; a second installation groove and a dovetail groove opening upward and parallel to each other are provided between the upper edge strips on both sides of the slide rail beam, the second installation groove is used for fixedly installing the roller assembly, and the dovetail groove is used for embedding the dovetail slide rail.

[0010] A further technical solution of the present invention is: the dovetail groove is provided with a trumpet opening at one end of the rear end frame close to the UAV cargo compartment to facilitate the insertion and withdrawal of the dovetail slide rail matched therewith.

[0011] A further technical solution of the present invention is: the roller assembly includes a roller groove and a roller, the roller groove is a U-shaped groove with its opening facing upward, and a plurality of rollers are arranged in a straight line and installed in the roller groove; a plurality of groups of mounting ears are symmetrically provided on the side walls on both sides of the roller groove, and the roller is rotatably installed around its mounting axis between a group of mounting ears of the roller groove; the bolt, as the mounting axis of the roller, passes through the central axis hole of the roller and a corresponding group of mounting ears, and is fixed and limited by a nut; the bottom surface of a mounting plate on one side of the dovetail slide rail contacts the outer diameter surface of the roller.

[0012] A further technical solution of the present invention is: the roller groove is designed in sections, each section of the roller groove has the same structure, and both ends thereof are provided with mounting plates; a plurality of partition plates are provided in the second mounting groove to divide the second mounting groove into groove sections matching the number of the multiple sections of the roller groove, and a section of the roller groove is installed in each partitioning groove section of the second mounting groove, and adjacent partition plates and mounting plates are connected by fasteners to fix the sections of the roller groove with the sections of the second mounting groove.

[0013] A further technical solution of the present invention is that the panel is a honeycomb panel, which is formed by gluing an aluminum alloy sheet to the outer surface of an aramid paper honeycomb.

[0014] A further technical solution of the present invention is: a plurality of pull ring supports are symmetrically fixed on both sides of the side end frame of the skeleton plate facing the drone cargo hold, which are used to fix the straps for transversely binding the goods; a front limiting beam is fixed on the side of the skeleton plate facing the front end frame of the drone, which is used to limit the front end of the pallet assembly and fix one end of the strap for longitudinally binding the goods; a rear limiting support is fixed on the rear end frame of the drone, which is used to limit the rear end of the loaded goods and fix the other end of the strap for longitudinally binding the goods.

[0015] A further technical solution of the present invention is: the front limiting beam is provided with two protrusions facing the front end frame of the drone, and the two protrusions are matched and docked with two inner recesses formed by the staggered ribs on the front end frame for limiting position; both ends of the front limiting beam are provided with pull rings for fixing the straps.

[0016] A further technical solution of the present invention is: the pallet assembly is divided into two connected sections along its sliding direction according to the specifications of the loading cargo box, including a first pallet assembly and a second pallet assembly, the first pallet assembly is close to the front end frame 6 of the drone cargo compartment, and the second pallet assembly is close to the rear end frame 4 of the drone cargo compartment; the front limiting beam is installed on the skeleton plate of the first pallet assembly facing the front end frame side.

[0017] A further technical solution of the present invention is: the dovetail slide rail is made of wear-resistant steel material; the slide rail beam is machined from 7075-T651 aluminum alloy and hard anodized to increase wear resistance.

[0018] Beneficial Effects

[0019] The beneficial effects of the present invention are as follows: the present invention provides a rapid loading and unloading device for a cargo drone, in which the dovetail slide rail at the bottom of the pallet assembly is slidably matched with the slide rail beam installed on the lower frame of the drone cargo compartment, so as to support and guide the pallet assembly. In conjunction with the roller assembly installed on the slide rail beam, the sliding friction of the dovetail slide rail relative to the slide rail beam is reduced, so that the cargo boxes placed on the pallet assembly and its panel can slide along the predetermined track under the action of a relatively small external force, and the cargo transportation is efficient and labor-saving. The operator does not need to enter the drone cargo compartment to apply force, and can push the pallet assembly loaded with cargo boxes into the cargo compartment by operating outside the cargo compartment.

[0020] In the present invention, two slide rail beams are embedded and installed on the lower frame of the cargo hold, and together with the lower frame, they form a metal frame for loading cargo in the vertical and horizontal directions. The upper surface of the frame is flush, and the two slide rail beams do not occupy additional space inside the cargo hold. The roller assembly is embedded and installed in the second installation groove of the slide rail beam, and the lower end of the dovetail slide rail of the pallet assembly is embedded in the dovetail groove of the slide rail beam, which reduces the installation height of the pallet assembly and makes the panel closer to the lower frame of the cargo hold, effectively saving space in the cabin and making the effective loading space as large as possible to meet freight requirements. The height of the pallet assembly of the present invention above the lower frame does not exceed 30 mm, which is lower than the installation height of the traditional pallet transport structure, saving cabin space. Combined with the overall structure and material weight reduction design, the overall weight is lighter than the traditional pallet transport structure.

[0021] The front limiting beam, pull ring support and rear limiting support arranged around the pallet assembly facilitate the fixing of the straps and the limiting of the cargo: the limiting of the front limiting beam matches the rib plate design on the front frame of the drone itself, which limits the front end of the pallet assembly, and the rear limiting support is fixed to the rear frame of the drone cargo cabin, which limits the rear end of the cargo box; the right-hand coordinate system is adopted, the reverse heading is the positive X direction, and the Z axis is vertically upward. The structure limits the X-direction freedom of the cargo box through the front frame and the rear limiting support, and the limiting method is simple and efficient; at the same time, the matching form of the dovetail guide rail of the pallet assembly and the dovetail groove of the slide rail beam plays a guiding role in ground loading and unloading transportation, and constrains the Y-direction and Z-direction freedom of the loaded cargo box during flight. Therefore, the structure of the present invention cancels the structural design of the card slots on both sides of the cabin body in the traditional structure, which simplifies the structure while ensuring the limitation and fixation of the cargo, and also plays a weight reduction effect.

[0022] According to the specifications and dimensions of the loading box, the pallet assembly of the present invention can be divided into sections along the guide rail according to the needs, and can be divided equally or unequally to determine the specifications and dimensions of the loaded cargo, which is convenient for loading and unloading. The segmented pallet assembly is also easy to repair. If one section is damaged, only the damaged section needs to be repaired. At the same time, the roller groove of the present invention adopts a segmented design, which is convenient for the inspection and maintenance of the installed rollers. When a section of the roller assembly fails, the entire section can be disassembled and replaced for repair.

[0023] The loading and unloading device of the present invention has a simple structure, guarantees the use space of the cargo hold to the maximum extent, is labor-saving and efficient in loading and unloading the cargo box, is convenient for fixing the cargo box, and is convenient for disassembly, assembly and replacement of wearing parts, and has high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the installation of the quick loading and unloading device for the cargo drone of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the tray assembly;

[0026] Figure 3 Schematic diagram of the front limit beam structure;

[0027] Figure 4 It is a schematic diagram of the cooperation between the protrusion of the front limiting beam and the front end frame;

[0028] Figure 5 This is a schematic diagram of the installation of the slide rail beam assembly;

[0029] Figure 6 It is a schematic diagram of the slide rail beam structure;

[0030] Figure 7 is a cross-sectional view of the slide rail beam;

[0031] Figure 8 It is a cross-sectional view of the installation of the tray assembly and the slide rail beam assembly;

[0032] Fig. 9 It is a schematic diagram of the connection between the slide rail beam and the frame beam of the lower frame;

[0033] Fig.10 It is a schematic diagram of the installation position of the rear limit support structure and its inner metal pad;

[0034] Fig.11 Schematic diagram of cargo loading and unloading in the cargo hold of a cargo drone.

[0035] Description of reference numerals: 1. tray assembly, 11. panel, 12. frame plate, 13. dovetail slide rail, 131. mounting plate, 132. dovetail portion, 14. pull ring support, 15. front limit beam, 151. bump, 2. slide rail beam assembly, 21. slide rail beam, 211. dovetail groove, 212. upper edge strip of slide rail beam, 213. web of slide rail beam, 214. first mounting groove, 215. connecting piece, 21 6. Second mounting groove, 217. Baffle plate, 22. Roller assembly, 221. Roller groove, 222. Roller, 223. Mounting plate, 224. Roller mounting bolt, 3. Lower frame, 31. Frame beam of lower frame, 311. Inner edge strip of frame beam of lower frame, 4. Rear end frame, 5. Side end frame, 6. Front end frame, 7. Rear limit support, 71. Metal pad, 8. Cargo box, 9. Straps, 10. Secure trailer. DETAILED DESCRIPTION

[0036] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] The present embodiment provides a rapid loading and unloading device for a cargo drone, which is installed in the cargo hold of the cargo drone to achieve rapid loading and unloading and fixation of cargo. It has the characteristics of simple structure, light weight, small cabin space occupation, labor-saving loading and unloading, and can be easily pushed and pulled for loading and unloading outside the cargo hold.

[0039] See also Figure 1 , the cabin frame of the drone cargo compartment is as follows Figure 1 As shown, it includes a front end frame 6 of the cargo hold near the head of the drone, a rear end frame 4 opposite to the front end frame 6, side end frames 5 located on both sides of the cargo hold, a lower frame 3 located at the bottom of the cargo hold, and a top frame (not shown). The loading and unloading device includes a pallet assembly 1 and a slide rail beam assembly 2. The slide rail beam assembly 2 is provided with two groups, which are arranged in parallel and installed on the lower frame 3 of the drone cargo hold along the axial direction of the drone body (i.e. the direction of travel of the drone), located in the lateral middle position of the lower frame 3, and a certain distance is maintained between the two groups of slide rail beam assemblies 2 to achieve stable support for the pallet assembly 1. The pallet assembly 1 is horizontally slidably installed on the two groups of slide rail beam assemblies 2, and the pallet assembly 1 is used to carry cargo.

[0040] See also Figure 5-9The slide rail beam assembly 2 includes a slide rail beam 21 and a roller assembly 22. The slide rail beam 21 is a double-web structural beam, which is machined from 7075-T651 aluminum alloy and hard anodized to increase wear resistance. The slide rail beam 21 is horizontally overlapped on multiple frame beams 31 of the lower frame 3. The upper edge bar 212 of the slide rail beam 21 is in surface contact with the inner edge bar 311 of the lower frame beam 31. The two webs 213 of the slide rail beam are provided with a disconnection groove at each frame beam 31 of the lower frame 31, which is used to avoid the frame beam 31 of the lower frame, so as to realize the cross-engaging overlap between the two, ensure the stability of the overlap and save space. A first installation groove 214 opening downward is formed between the double webs 213 of the slide rail beam, and a connecting piece 215 is embedded and installed in the first installation groove 214. The connecting piece 215 is a supporting angle plate structure, and the frame beam 31 of the lower frame and the double webs 213 of the slide rail beam are connected by inserting fasteners to fix the slide rail beam 21 and the lower frame 3. There are multiple connecting pieces 215, which are located at the cross-jointed overlap of the frame beam 31 of the lower frame and the slide rail beam 21 at each location. A second installation groove 216 and a dovetail groove 211 opening upward and parallel to each other are provided between the upper edge strips 212 on both sides of the slide rail beam 21, and the roller assembly 22 is fixedly installed in the second installation groove 216. The dovetail groove 211 is used to cooperate with the dovetail slide rail 13 of the tray assembly 1, and the sliding cooperation between the tray assembly 1 and the slide rail beam 21 is achieved by embedding and installing the dovetail slide rail 13 in the dovetail groove 211. The roller assembly 22 is used to reduce the sliding friction between the dovetail slide rail 13 and the slide rail beam 21 .

[0041] See also Figure 2 , 6 8. The pallet assembly 1 includes a panel 11, a frame plate 12 and a dovetail slide rail 13. The frame plate 12 is a crisscross frame plate structure, and the upper end surface thereof is fully paved with the panel 11. The frame plate 12 is fixedly connected to the panel 11, and the panel 11 is used to place goods. The panel 11 is a honeycomb panel, which is made of an aluminum alloy sheet bonded to the outer surface of an aramid paper honeycomb, with a total thickness of 10 mm and a density of 308 kg / m 3 , with the characteristics of good rigidity and light weight. The width of the panel 11 is the same as the width of the standard cargo box. Two dovetail rails 13 are provided, forming two parallel beams of the frame plate 12. The two dovetail rails 13 are arranged corresponding to the two rail beams 21. The mounting plates 131 are formed on both sides of the upper end of the dovetail rail 13. The mounting plates 131 on both sides are fixedly connected to the frame plates of the frame plates 12 on the corresponding sides by fasteners, and are fixedly connected to the panel 11. The frame plate of the frame plate 12 is made of L-shaped aluminum alloy with a density of 2800kg / m 3, lightweight and durable. The frame plate of the skeleton plate 12 and the two dovetail rails 13 together constitute the frame structure of the skeleton plate 12. The dovetail portion 132 at the lower end of the dovetail rail 13 is embedded in the dovetail groove 211 of the corresponding slide rail beam 21, and slides with it to realize the sliding of the tray assembly 1 along the slide rail beam assembly 2 as a whole. A trumpet opening is provided at one end of the dovetail groove 211 near the rear end frame 4 of the drone cargo compartment to facilitate the insertion and extraction of the dovetail rail 13 that cooperates with it, thereby facilitating the tray assembly 1 to enter the drone cargo compartment. In this embodiment, the dovetail rail 13 is made of wear-resistant steel material with a density of 7800kg / m 3 , strong durability.

[0042] See also Figure 5-8 The roller assembly 22 includes a roller groove 221 and a roller 222. The roller groove 221 is a U-shaped groove structure, with an opening facing upward and a bottom embedded in the second mounting groove 216 of the slide rail beam 21. A plurality of rollers 222 are arranged in a straight line and installed in the roller groove 221. Specifically, the side walls of the roller groove 221 are symmetrically provided with multiple groups of mounting lugs, each group of mounting lugs is coaxially provided with mounting holes, and each roller 222 is rotatably installed between a group of mounting lugs of the roller groove 221 through a roller mounting bolt 224. The bolt 224 passes through the central axis hole of the roller 222 and the corresponding group of mounting lugs, and is fixed and limited by a nut. The bottom surface of the mounting plate 131 of the dovetail slide rail 13 facing the roller assembly 22 contacts the outer diameter surface of the roller 222. When the dovetail slide rail 13 of the tray assembly 1 slides along the slide rail beam 21, the friction force of the sliding of the tray assembly 1 can be reduced through the rotation support of the roller 222. The roller groove 221 and the roller 222 are made of steel parts with good wear resistance.

[0043] In order to facilitate the inspection and replacement of wearing parts, the roller groove 221 in this embodiment is designed in sections, and each section of the roller groove 221 has the same structure, and both ends are provided with mounting plates 223. Correspondingly, a plurality of baffles 217 are provided in the second mounting groove 216 to divide the second mounting groove 216 into groove sections matching the number of the multiple sections of the roller groove 221. A section of the roller groove 221 is installed in each dividing groove section of the second mounting groove 216, and the adjacent baffles 217 and mounting plates 223 are connected by fasteners to fix each section of the roller groove 221 with each section of the second mounting groove 216. The segmented design is convenient for disassembly, maintenance and replacement. If a single roller 222 in a section of the roller groove 221 is damaged, it can be replaced in the cargo hold. If multiple rollers 222 in a section of the roller groove 221 fail, in order to reduce the maintenance time in the cabin, the roller assembly 22 of this section can be directly disassembled as a whole, and replaced and repaired outside the cargo hold before entering the cargo hold for installation.

[0044] See also Figure 2-410. In order to fix the cargo box 8 placed on the panel 11, a plurality of pull ring supports 14 are symmetrically fixed on both sides of the frame plate 12 facing the side end frame 5 of the drone cargo compartment. The pull ring supports 14 are fixedly connected to the frame plate 12 through fasteners. The pull ring supports 14 are provided with pull rings for fixing the straps 9 for horizontally binding the cargo box 8. A front limiting beam 15 is fixedly installed in the middle of one side of the frame plate 12 facing the front end frame 6 of the drone. The front limiting beam 15 is used for limiting the front end of the pallet assembly 1 and fixing one end of the strap 9 for longitudinally binding the cargo box. The front limiting beam 15 is provided with two protrusions 151 on the side of the front end frame 6 facing the drone cargo compartment. The two protrusions 151 match and dock with two concave places formed by the staggered rib plates on the front end frame 6. When the pallet assembly 1 is pushed into the drone cargo compartment and leans against the front end frame 6, the two protrusions 151 are embedded in the two concave places of the front end frame 6 for limiting. Both ends of the front limiting beam 15 are provided with pull rings for fixing the straps 9 for longitudinally binding the cargo. There are two rear limit supports 7, which are installed on the rear end frame 4 of the UAV cargo compartment through fasteners. A pull ring is provided on the rear limit support 7 for fixing the other end of the strap for longitudinally binding the cargo. At the same time, the rear limit support 7 forms a limit on the cargo box on the side facing the cargo box. The metal pads 71 ​​of different thicknesses can be installed on the side of the rear limit support 7 facing the cargo box as design compensation.

[0045] See also Figure 1 In order to facilitate the support and loading and unloading of the cargo box 8, the pallet assembly 1 can be divided into multiple sections along its sliding direction according to the size of the loading cargo box. One standard cargo box can correspond to one pallet assembly, two standard cargo boxes can correspond to one pallet assembly, or three standard cargo boxes can correspond to one pallet assembly. The segmented design of the pallet assembly 1 is lighter in loading and unloading weight than the overall design, and is easy to operate. In this embodiment, a small and medium-sized cargo drone is used, and the length of the cargo compartment transport loading area is 3m. It is designed to load 5 standard cargo boxes with a length, width and height of 0.6m×0.8m×0.8m, and the loading weight is 500kg. The pallet assembly 1 adopts a two-section splicing structure, including a first pallet assembly and a second pallet assembly, wherein the first pallet assembly carries three standard cargo boxes, and the second pallet assembly carries two standard cargo boxes. The length of the panel of the first pallet assembly along its slide rail direction is 1.8m, and the length of the panel of the second pallet assembly along its slide rail direction is 1.2m. The width of the panels of the two sets of tray assemblies is 0.8m. The first pallet assembly is close to the front frame 6 of the drone cargo compartment, and the second pallet assembly is close to the rear frame 4 of the drone cargo compartment. A total of 6 pull ring supports 14 are fixed on both sides of the first pallet assembly, and a total of 4 pull ring supports 14 are fixed on both sides of the second pallet assembly. The front limit beam 15 is installed on the first pallet assembly. When loading, the first pallet assembly and the second pallet assembly are loaded in sequence, and when unloading, the second pallet assembly and the first pallet assembly are unloaded in sequence.

[0046] See also Fig.11, when it is necessary to load goods: first completely pull out the first pallet assembly and the second pallet assembly, separate them from the drone body, place the first pallet assembly on the support trailer 10 (the support trailer 10 is provided with a slide rail beam and roller assembly similar to the cargo hold to reduce manpower), push the support trailer 10 to the cargo box logistics transport vehicle, load 3 standard cargo boxes, and fix the cargo boxes in the horizontal direction, i.e., the left and right directions, by the straps 9, which are fixed on the pull ring supports 14 on the left and right sides of the first pallet assembly. When the straps 9 in the longitudinal direction, i.e., the front and rear directions of the cargo box are fixed, the front end is fixed on the pull ring of the front limit beam 15, first pull the longitudinal fixing straps 9 to the top of the cargo box, push the support trailer 10 loaded with 3 standard cargo boxes to the rear end of the drone cargo hold, push the dovetail slide rail 13 of the first pallet assembly loaded with cargo boxes into the dovetail groove 211 of the slide rail beam in the cargo hold, and then push it into the cargo hold to the front frame 6, and the front limit beam 15 installed at the front end of the first pallet assembly reaches the limit state. Then, in the same way, the second pallet assembly loaded with two standard cargo boxes is also pushed into the drone cargo hold and is completely close to the first pallet assembly. Two rear limit supports 7 are fixed on the rear end frame 4 and fixed with bolts and pallet nut assemblies. The rear limit support 7 can be installed with metal pads 71 ​​of different thicknesses on the side facing the cargo box as design compensation, which is close to the rearmost cargo box on the second pallet assembly close to the rear end frame 4 to play a limiting role. Then, the longitudinal strap 9 for fixing the front and rear directions is passed through the top of the cargo box and fixed on the pull ring of the rear limit support 7 to completely fix the cargo. A right-handed coordinate system is used, with the reverse heading as the positive X direction and the Z axis vertically upward. The front end frame 6 and the rear limit support 7 limit the X-direction freedom of the cargo box, and the dovetail guide rail and the dovetail groove cooperate to constrain the Y-direction and Z-direction freedom of the loaded cargo box.

[0047] When it is necessary to unload the cargo, first unfasten the longitudinal fixing strap 9 fixed on the rear limit support 7 of the cargo hold, remove the rear limit support 7, completely pull out the second pallet assembly and place it on the support trailer 10, push the trailer 10 to the logistics transport vehicle, unfasten the transverse strap 9 on the second pallet assembly, unload the cargo box, then pull the trailer back to the rear of the drone cargo hold, and remove the second pallet assembly. Then pull out the first pallet assembly and place it on the support trailer 10, push it to the logistics transport vehicle, unfasten the transverse strap that fixes the cargo, unload the cargo box, then pull the support trailer 10 back to the rear of the drone cargo hold, then load the first pallet assembly into the cargo hold, then load the second pallet assembly into the cargo hold, and install the rear limit support 7.

[0048] It can be seen that the present invention integrates the functional parts and structural parts for fast transportation, which saves the effective loading space of the cargo hold and saves weight compared with the traditional form. The dovetail guide rail and dovetail groove play a guiding role in ground loading and unloading transportation. During the flight, this form constrains the Y and Z degrees of freedom of the loaded cargo box, and limits the X-direction freedom of the cargo box through the front frame and the rear limit support. The rear limit support adopts a design compensation to effectively fix the cargo box and limit the displacement in three directions; the roller assembly reduces the friction during transportation, saves manpower, and the form adopted is convenient and quick to replace; the overall weight of the pallet assembly is lighter than the traditional one; the present invention can meet the requirements of rapid loading and unloading of cargo drones, and is convenient and quick to disassemble and assemble.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A rapid loading and unloading device for a cargo drone, characterized in that: It includes a tray assembly and a slide rail beam assembly; the slide rail beam assembly is provided with two groups, which are arranged in parallel and installed on the lower frame of the drone cargo compartment along the axial direction of the drone; the tray assembly is horizontally slidably installed on the two groups of slide rail beam assemblies for carrying cargo; The slide rail beam assembly includes a slide rail beam and a roller assembly; the slide rail beam is horizontally arranged, the bottom of which is fixedly connected to the frame beam of the lower frame, and the upper end of which is provided with a dovetail groove for cooperating with the dovetail slide rail of the tray assembly; the roller assembly is parallelly installed on one side of the dovetail groove, for reducing the sliding friction between the dovetail slide rail and the slide rail beam; The pallet assembly includes a panel, a frame plate and a dovetail slide rail; the frame plate is a criss-cross frame plate structure, the upper end surface of which is fully paved with a panel, the frame plate is fixedly connected to the panel, and the panel is used to place goods; the dovetail slide rails are provided with two, forming two parallel beams of the frame plate, and the two dovetail slide rails are arranged corresponding to the two slide rail beams; the mounting plate at the upper end of the dovetail slide rail is fixedly connected to the frame plate of the frame plate on the corresponding side, and the dovetail portion at the lower end of the dovetail slide rail is embedded in the dovetail groove of the corresponding slide rail beam and slides with it.

2. The rapid loading and unloading device for a cargo drone according to claim 1, characterized in that: The slide rail beam is horizontally overlapped on multiple frame beams of the lower frame, the upper edge strip of the slide rail beam is in surface contact with the inner edge strip of the frame beam of the lower frame, and the two webs of the slide rail beam are provided with disconnect grooves at each frame beam of the lower frame for avoiding the frame beam of the lower frame; a first installation groove with an opening downward is formed between the two webs of the slide rail beam, and a connecting piece is embedded and installed in the first installation groove for fixedly connecting the slide rail beam and the frame beam of the lower frame; a second installation groove and a dovetail groove with an opening upward and parallel to each other are provided between the upper edge strips on both sides of the slide rail beam, the second installation groove is used for fixedly installing the roller assembly, and the dovetail groove is used for embedding the dovetail slide rail.

3. The rapid loading and unloading device for a cargo drone according to claim 2, characterized in that: The dovetail groove is provided with a trumpet opening at one end of the rear end frame close to the UAV cargo compartment, so as to facilitate the insertion and withdrawal of the dovetail slide rail matched therewith.

4. The rapid loading and unloading device for a cargo drone according to claim 2, characterized in that: The roller assembly includes a roller groove and a roller. The roller groove is a U-shaped groove with an opening facing upward. A plurality of rollers are arranged in a straight line and installed in the roller groove. A plurality of groups of mounting ears are symmetrically provided on the side walls of the roller groove. The roller is rotatably installed around its mounting axis between a group of mounting ears of the roller groove. The bolt, as the mounting axis of the roller, passes through the central axis hole of the roller and a corresponding group of mounting ears, and is fixed and limited by a nut. The bottom surface of a mounting plate on one side of the dovetail slide rail contacts the outer diameter surface of the roller.

5. The rapid loading and unloading device for a cargo drone according to claim 4, characterized in that: The drum groove is designed in sections, and each section of the drum groove has the same structure and is provided with mounting plates at both ends; a plurality of baffle plates are provided in the second mounting groove to divide the second mounting groove into groove sections matching the number of the multiple sections of the drum groove, and a section of the drum groove is installed in each dividing groove section of the second mounting groove, and adjacent baffle plates and mounting plates are connected by fasteners to fix the sections of the drum groove with the sections of the second mounting groove.

6. The rapid loading and unloading device for a cargo drone according to claim 1, characterized in that: The panel is a honeycomb panel, which is made of an aramid paper honeycomb with an aluminum alloy sheet glued to its outer surface.

7. The rapid loading and unloading device for a cargo drone according to claim 1, characterized in that: A plurality of pull ring supports are symmetrically fixed on both sides of the side end frame of the skeleton plate facing the drone cargo hold, which are used to fix the straps for transversely binding the goods; a front limiting beam is fixed on the side of the skeleton plate facing the front end frame of the drone, which is used to limit the front end of the pallet assembly and fix one end of the strap for longitudinally binding the goods; a rear limiting support is fixed on the rear end frame of the drone cargo hold, which is used to limit the rear end of the loaded goods and fix the other end of the strap for longitudinally binding the goods.

8. The rapid loading and unloading device for a cargo drone according to claim 7, characterized in that: The front limiting beam is provided with two protrusions on the front end frame side facing the drone cargo compartment, and the two protrusions match and dock with two inner recesses formed by the ribs on the front end frame for limiting; both ends of the front limiting beam are provided with pull rings for fixing the straps.

9. The rapid loading and unloading device for a cargo drone according to claim 8, characterized in that: The pallet assembly is divided into two connected sections along its sliding direction according to the specifications of the loading cargo box, including a first pallet assembly and a second pallet assembly. The first pallet assembly is close to the front end frame of the drone cargo compartment, and the second pallet assembly is close to the rear end frame of the drone cargo compartment; the front limiting beam is installed on the skeleton plate of the first pallet assembly facing the front end frame side.

10. The rapid loading and unloading device for a cargo drone according to claim 1, characterized in that: The dovetail slide rail is made of wear-resistant steel material; the slide rail beam is machined from 7075-T651 aluminum alloy and hard anodized to increase wear resistance.

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