CN212009605U - Random cargo rapid loading system with multiple loading units for branch cargo aircraft - Google Patents
Random cargo rapid loading system with multiple loading units for branch cargo aircraft Download PDFInfo
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Abstract
The utility model relates to a quick cargo loading system with multiple loading units for a branch cargo aircraft, which comprises an inlet conveying part, a scanning and measuring part, a centralized control part, a code pasting part, a code scanning part, a pushing part and an outlet conveying part, wherein the inlet conveying part transmits random cargo; the scanning and measuring part scans random goods and transmits data to the centralized control part; the centralized control part generates an information bar code, a standardized loading model and a loading unit model, and controls the inlet conveying part, the pushing part, the code scanning part and the outlet conveying part; the code pasting part pastes corresponding bar codes to the random goods; the code scanning part scans the random goods with the stickers from the code pasting part; the pushing part, the code scanning part and the outlet conveying part are arranged in a one-to-one correspondence manner; the outlet conveying part conveys the random goods to the outlet position, so that the purpose of quickly and accurately loading the random goods into the loading units of the branch goods machine with different loading requirements is realized, and the method can be widely applied to the technical field of branch air logistics transportation.
Description
Technical Field
The utility model relates to a quick stowage system of many loading units of branch line cargo aircraft random goods especially relates to a stowage system in being used for carrying random bulk cargo quick, high-efficient, accurate stowage to having the loading unit of clear and definite stowage requirement, belongs to system control method technical field.
Background
With the rapid development of electronic commerce and logistics industry worldwide, the size of the logistics service has been gradually increased, and meanwhile, the logistics service has been developed from the demand of single goods delivery to the demand of diversified classified delivery, timely delivery and quality delivery, which puts requirements on multi-level air transportation on the aspect of air logistics. In 2018, the first global annual report focusing on the development of the unmanned aerial vehicle industry in the logistics field, namely the annual report of the development of the world logistics unmanned aerial vehicle industry, was published in Jingdong. The reporting system combs the technical level, policy environment, market demand and other core elements of the world logistics unmanned aerial vehicle industry development, particularly performs key analysis on the latest development strategy of major world logistics unmanned aerial vehicle enterprises such as amazon, UPS and Google, and simultaneously combines the development demand of the national logistics industry to firstly provide a future 'trunk-branch-tail end' three-level intelligent aviation logistics system.
Because the concept of the multi-stage air transportation logistics system is just proposed, the standard definition of the multi-stage air transportation logistics system of the trunk line, the branch line and the tail end is not provided at present. According to the existing civil aviation system standard, the trunk-level cargo aircraft are wide-body cargo aircraft and narrow-body cargo aircraft of the current civil aviation transportation system, the range of the aircraft is generally hundreds of kilometers to thousands of kilometers, and the single cargo capacity is dozens of tons to hundreds of tons. The tail-end freight aircraft is the multi-rotor unmanned aerial vehicle for current cargo carrying, the range of the multi-rotor unmanned aerial vehicle is generally within 30 kilometers, and the single cargo carrying capacity is within 30 kilograms. The transport distance and the cargo capacity of the branch-level cargo aircraft are between a 'trunk line' and a 'tail end' aviation logistics system, different models of aircraft can be researched and developed according to specific cargo transportation requirements, the branch-level cargo aircraft is suitable for aviation logistics transportation from logistics hub nodes to logistics center nodes in provincial regions, the voyage of the branch-level cargo aircraft is generally 100-500 kilometers, and the single cargo capacity is about 1-5 tons.
At present, a branch-level cargo plane belongs to a blank interval in a three-level aviation logistics system, is still in a starting stage in a global scope, and with the vigorous demand of the aviation logistics market in China and the gradual refinement of the industry, the research and development of China in the field are faster. In 10 months in 2017, a branch-level freight unmanned aerial vehicle AT200 developed by the department of engineering thermophysics research of Chinese academy of sciences and the Langxing unmanned aerial vehicle company as a general unit and the units of aviation industry 618, China Electricity 54, aerospace 773, West industry and the like is combined to complete first flight. The effective load of the machine reaches 1.5 tons, the total length is 11.84 meters, the wingspan is 12.80 meters, the height is 4.04 meters, and the volume of the cargo hold is 10 cubic meters. The unmanned aerial vehicle can efficiently finish point-to-point freight branch line transportation service, and is a first-money tonnage level branch line level freight unmanned aerial vehicle in the world.
At present, a branch-line-level cargo unmanned aerial vehicle in research and development mainly performs flight performance test flight of an air vehicle, and does not perform flight tests under cargo loading conditions, and the series of unmanned aerial vehicles still need to perform a series of flight tests of different cargo loading capacity, multiple complex flight environments, different take-off and landing conditions and the like to reach a test flight certification standard, so that the unmanned aerial vehicle can be really served in the aviation logistics industry of China. For the existing branch-line-level manned machine, the unmanned aerial vehicle is mainly used in the fields of manned, surveying, aerial photography, agriculture and forestry plant protection and the like, rarely relates to a cargo loading process, and adopts a manual loading mode due to the fact that the cargo loading capacity is small even if the cargo loading process exists. Therefore, no matter whether the branch-level freight unmanned aerial vehicle is under development or the mature branch-level unmanned aerial vehicle is adopted, the efficient cargo loading scheme applied to the logistics industry is not available at present.
With the diversified development of the aviation logistics demand, the gradual improvement of a three-level intelligent aviation logistics system of 'trunk-branch-tail' gradually makes the 'branch' aviation logistics transportation relatively blank become a hot spot of technical and market research. The problem of cargo loading efficiency inevitably becomes one of core technical indexes influencing the development of the branch cargo aircraft, and the improvement of the indexes can not only improve the operation efficiency of the branch cargo aircraft in an airport working interval in an aviation logistics system, but also improve the cargo transport professional capacity of the airport. At present, the technology of an industrial grade branch line freight airplane applied to the logistics industry in the civil field is still in the research and development starting stage, the matched efficient cargo loading technology is in the germination stage, and the rapid research and development of the innovative technology is urgently needed.
For the existing trunk-level cargo aircraft, the cabin structures are both wide-body structures and narrow-body structures, and an aviation container (Unit Load Device, abbreviated as ULD) is adopted to finish the efficient loading of cargoes in the cargo loading process. Because the cabin structure is large, the change range of the center of gravity of the airplane is small in the cargo loading process, and the container unit only considers the cargo loading technical problem and has small relevance with the cabin structure. However, the cabin structure of the branch-line-level cargo aircraft is much smaller, the cabin structure belongs to an ultra-narrow cabin structure, the change rule of the gravity center of the cabin structure is obviously different from that of the main-line-level cargo aircraft in the loading process, in order to meet the requirement of the integral counterweight of the aircraft, the counterweight of each container unit is distributed according to the integral counterweight, the counterweight mass is different, the weight and the volume of the cargo are different, the problem of standardized loading of random cargo is solved, and therefore a set of efficient, rapid and accurate loading system is required to realize the standardized loading of the random cargo.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a technical scheme does:
a rapid cargo allocation system for multiple loading units of a branch cargo aircraft comprises an entrance conveying part, a scanning and measuring part, a centralized control part, a code pasting part, a code scanning part, a pushing part and an exit conveying part, wherein,
the entrance conveying part is used for carrying the random cargo to a preset position and then conveying the random cargo to the position of the scanning measuring part;
the scanning measurement part is used for scanning the geometric dimension and the weight of the random goods and transmitting the data obtained by scanning to the centralized control part;
the centralized control part generates information bar codes of random cargos, generates a cargo standardized loading model and a loading unit model through data obtained by scanning, then generates a final cargo loading scheme, and controls the working states of the inlet conveying part, the pushing part, the code scanning part and the outlet conveying part;
the code pasting part pastes corresponding bar codes to the random goods after receiving the scanning information about the random goods in the centralized control part;
the code scanning part is used for scanning the random goods with the pasted codes from the code pasting part according to the final goods loading scheme;
the pushing part is used for pushing the random goods after code scanning to the position of the outlet conveying part, and the pushing part is arranged in one-to-one correspondence with the code scanning part and the outlet conveying part;
the outlet conveying part is used for conveying the pushed random cargos to an outlet position, and the outlet position is connected with the loading unit.
Further, the inlet conveying part comprises an inlet conveying belt, an endless conveying belt and a driving operation motor; and a safety distance S is arranged between one end of the inlet conveyor belt, which is far away from the circulating conveyor belt, and the circulating conveyor belt.
Further, the scanning and measuring part comprises a geometric dimension scanning system and a cargo weighing system, wherein the geometric dimension scanning system is used for scanning the geometric dimension of the random cargo, and the cargo weighing system is used for measuring the weight of the random cargo; the geometric dimension scanning system and the cargo weighing system are both electrically connected with the centralized control system; the distance between the scanning measuring part and the code pasting part is M.
Further, the centralized control section includes a controller and a computer for receiving, storing, transmitting data, generating a three-dimensional model, and loading logical operations.
Furthermore, the code pasting part comprises a bar code pasting machine, and the code pasting machine is electrically connected with the centralized control part; the distance between the code scanner and the pushing part is L; the code scanning part comprises a bar code scanner which is connected with the pushing part through an electric signal; the installation heights of the code scanning part and the code pasting part are consistent; the minimum value of the geometric dimension of the random goods is 1.5 times larger than the maximum value of the geometric dimension of the bar code of the code pasting part; the code scanning parts are arranged along the interval of the circulating conveyor belt and are four.
Further, the pushing part comprises a conveying belt for pushing and a driving motor corresponding to the conveying belt, and the driving motor is electrically connected with the centralized control part; the propelling movement portion sets up along the endless conveyor interval to establish to four, and all set up the inboard at endless conveyor.
Further, the outlet conveying part comprises an outlet conveying belt and an outlet motor, and the outlet motor is electrically connected with the centralized control part; the outlet conveying parts are four in number, arranged at intervals and arranged on the outer side of the circulating conveying belt.
Further, a safety distance S is set between one end of the inlet conveyor belt far away from the circulating conveyor belt and the circulating conveyor belt, and S is 1.2 × V1 × N, where N is a characteristic length of the scanning portion in the direction of the circulating conveyor belt.
After the system above adopting, the utility model has the advantages of as follows:
1) the utility model provides an intelligent demand stowage technical method of random goods to a standardized stowage unit which is in line with industry standard, safe, reliable, high-efficiency, rapid and high in specialization degree, is particularly suitable for a branch line logistics transportation system in a three-level aviation logistics system of a trunk line, a branch line and a tail end, can greatly improve stowage efficiency of goods of a branch line cargo plane, and improves freight professional ability of an airport;
2) the technical method comprises the steps of measuring physical data of random goods in real time on line, synchronously generating a standardized goods loading model, and generating loading schemes of all loading units in real time on line according to a logic algorithm to realize the whole process from loading the random goods to loading the standardized goods;
3) according to the technical scheme, the goods can be completely circulated in the whole processes of code pasting, code allocation scheme generation and code scanning through the circulating conveyor belt, and efficient and accurate code allocation of the goods is guaranteed;
4) the technical method can realize accurate cargo allocation through the linkage design of the code scanning system and the pushing system.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a method can generate standardized loading model with random goods physical data fast, simultaneously according to each loading unit stowage demand, with every random goods high efficiency, quick, accurate stowage to each standardized loading unit in, realize random goods to the intelligent demand stowage of standardized loading unit.
The utility model discloses a goods stowage method concrete step do:
s1, dividing the cabin inside the branch cargo aircraft into four loading units, and respectively setting the four loading units as a front loading unit A, a front loading unit B, a rear loading unit A and a rear loading unit B according to the sequence from the front part to the tail part of the cabin of the branch cargo aircraft;
s2, simulating and generating a loading unit model corresponding to the loading unit model according to the loading volume and weight requirements of the front loading unit A, the front loading unit B, the rear loading unit A and the rear loading unit B in the S1;
s3, conveying random cargos to be loaded into the four loading units to designated positions one by one to scan the geometric sizes and weights of the random cargos, generating a cargo standardized loading model according to data obtained after scanning, and then incorporating the cargo standardized loading model into the loading unit model one by one according to a stowage logic algorithm to form a final loading scheme for the four loading units;
s4, generating a corresponding bar code according to the geometric and weight data of the random goods scanned in the S3, pasting the bar code on the corresponding random goods, and selectively scanning the random goods according to the loading information of the final loading scheme after pasting the bar code;
and S5, conveying the random goods after code scanning to a preset position, and loading the random goods into a corresponding loading unit through the preset position.
Wherein:
the front loading unit A, the front loading unit B, the rear loading unit A and the rear loading unit B are all three-dimensional spaces with regular shapes, and the corresponding centers of gravity of the front loading unit A, the front loading unit B, the rear loading unit A and the rear loading unit B are all located on the centers of the corresponding loading units.
Setting the rated speed of goods in the entrance transmission process into a code pasting stage speed V1 and a code scanning stage speed V2, wherein the speed V2 in the code scanning stage is 0.9 times of the corresponding dynamic code scanning speed in code scanning, so that the reliability and the transmission accuracy of scanned data are ensured; in the code pasting stage, the speed V1 is 0.9 times of the scanning speed when the random goods are scanned, so that the reliability and the transmission accuracy of code scanning data are ensured.
The entrance conveyer belt is kept away from and is equipped with safe distance S between the endless conveyor belt and the one end of endless conveyor belt, and S1.2 XV 1 XN, and wherein, N is the characteristic length of scanning portion along the endless conveyor belt direction, guarantees that random goods can accomplish scanning work alone.
When the method is used for realizing random cargo stowage, the following system is adopted for realizing the random cargo stowage.
With reference to fig. 1, a cargo loading system based on a branch cargo aircraft, which is used for loading random cargo 13 into loading units on the branch cargo aircraft and ensuring the branch cargo aircraft to be in a balanced state, comprises an entrance conveying part, a scanning and measuring part, a centralized control part, a code pasting part, a code scanning part, a pushing part and an exit conveying part, wherein,
the inlet conveying part is used for loading random goods to a preset position and then conveying the goods to the position of the scanning measuring part;
the scanning measurement part is used for scanning and measuring the geometric dimension and the weight of the goods to be loaded and transmitting the measured data to the centralized control part;
the centralized control part generates information bar codes of random cargos and a cargo loading scheme after receiving the scanned data and controls the working states of the inlet conveying part, the pushing part and the outlet conveying part;
the code attaching part attaches corresponding bar codes to the random goods after receiving the scanning information about the random goods in the centralized control part;
the code scanning part is used for scanning the random goods with the pasted codes from the code pasting part according to the final goods loading scheme;
the pushing part is used for pushing the random goods after code scanning to the position of the outlet conveying part, and the pushing part, the code scanning part and the outlet conveying part are arranged in a one-to-one correspondence manner;
the outlet conveying part is used for conveying the pushed random goods to an outlet position, and the outlet position is connected with the loading units of the branch goods machine.
The utility model provides a different weight of branch line cargo aircraft, the random goods stowage of different volumes to the technical problem in the standardized collection dress loading unit, through the utility model provides a delivery system will be random in the goods corresponds the loading unit of carrying the different stowage demands on the branch line cargo aircraft, accomplish the stowage process.
In specific implementation, the random cargo 13 is conveyed on an entrance conveying part in the system, firstly, the weight and the geometric dimension of the random cargo 13 are scanned and measured by a scanning and measuring part, and then, the obtained geometric dimension data and the weight data of the random cargo 13 are transmitted to a centralized control part in real time to construct a standardized model of the random cargo 13; meanwhile, barcode information data of the random goods 13 is sequentially generated, the data is transmitted to the code attaching part through the centralized control part, and barcode information is attached to the random goods 13 through the code attaching part; the centralized control part loads the standard random cargo 13 models generated in real time into the loading models of each loading unit by adopting a set logic loading method according to the counterweight requirements and the structural volume parameters of different loading units, finally generates a loading scheme meeting the counterweight and volume requirements of each loading unit, transmits control information to the code scanning part through the centralized control part, and the code scanning part scans the attached bar code information on the corresponding random cargo 13 according to the generated final loading scheme, thereby controlling the pushing part to realize the purpose of conveying the random cargo 13 into each loading unit.
The inlet conveying part comprises an inlet conveying belt 3, a circulating conveying belt 1 and a motor 4 which is driven to run; a safety distance S is arranged between one end of the inlet conveyor belt 3, which is far away from the circulating conveyor belt 1, and the circulating conveyor belt 1.
When actually conveying random goods 13 to the circulating conveyor belt 1, the random goods 13 firstly pass through the inlet conveyor belt 3, the inlet conveyor belt 3 is driven to operate through the motor 4, the random goods 13 are conveyed to the circulating conveyor belt 1 which is close to the inlet conveyor belt 3 in the moving process of the inlet conveyor belt 3, and then the random goods 13 run on the circulating conveyor belt 1 to perform subsequent operations.
The scanning and measuring part comprises a geometric dimension scanning system 10 and a cargo weighing system 11, wherein the geometric dimension scanning system 10 is used for scanning the geometric dimension of the random cargo 13, and the cargo weighing system 11 is used for measuring the weight of the random cargo 13; the geometric dimension scanning system 10 and the cargo weighing system 11 are both electrically connected with the centralized control part; the distance between the cargo weighing system 11 and the code pasting part is M.
The centralized control part comprises a controller and a computer, and the computer is used for receiving, storing and transmitting data, generating a three-dimensional model and carrying out logical operation.
The computer can select a common computer client in the prior art, loads geometric software for generating a three-dimensional model, generates a cargo standardized model by inputting the geometric size and weight of the random cargo 13, generates a corresponding loading model according to the self volume and the balance weight of each loading unit in the cabin, incorporates the cargo standardized model into the loading model to generate a final loading scheme, and sends the loading scheme to the code scanning part. The control part can be a single chip microcomputer board electrically connected with a control module in the prior art.
The distance between the goods weighing system 11 and the code pasting part is set to be M, so that the data transmission reliability and the accurate code pasting of the random goods 13 are guaranteed.
The code pasting part comprises a bar code pasting machine 12, and the code pasting machine 12 is in electric signal connection with the centralized control part; the distance between the code scanning part and the pushing part is L; the code scanning part comprises bar code scanners 9-1, 9-2, 9-3 and 9-4 which are in electric signal connection with the centralized control part; the installation heights of the code scanning part and the code pasting part are consistent; the minimum value of the geometric dimension of the random cargo 13 is 1.5 times larger than the maximum value of the geometric dimension of the bar code pasted by the pasting part.
In order to ensure the normal and stable operation of the system, in the setting process of the system, four bar code scanners 9-1, 9-2, 9-3 and 9-4 are connected in parallel and connected to the centralized control part through a bus, and are used for controlling a plurality of pushing parts to push random goods 13 after being scanned. Further, in order to ensure a sufficient space for attaching the bar code to the random cargo 13, the minimum value of the geometric size of the random cargo 13 is set to be 1.5 times larger than the maximum value of the geometric size of the bar code attached by the attaching portion.
The pushing part comprises pushing conveying belts 7-1, 7-2, 7-3 and 7-4 and corresponding driving motors 8-1, 8-2, 8-3 and 8-4, and the driving motors 8-1, 8-2, 8-3 and 8-4 are all electrically connected with the centralized control part.
The pushing conveying belts 7-1, 7-2, 7-3 and 7-4 are respectively arranged at intervals close to the circulating conveying belt 1 and used for pushing the random goods 13 after being scanned to the position of the outlet conveying part. The utility model discloses in, sweep a yard portion unanimous with the quantity of propelling movement portion, and be close to the setting. In position, several pushing portions are provided at positions inside the endless belt 1. The driving motors 8-1, 8-2, 8-3 and 8-4 are connected in parallel and then electrically connected with the centralized control part.
The outlet conveying part comprises outlet conveying belts 5-1, 5-2, 5-3 and 5-4 and also comprises outlet motors 6-1, 6-2, 6-3 and 6-4 for driving, and the outlet motors 6-1, 6-2, 6-3 and 6-4 are all electrically connected with the centralized control part.
The outlet conveying parts are arranged at the outer side positions of the circulating conveyor belt 1 and correspond to the pushing parts one by one, so that the random goods 13 are pushed out from the pushing parts and then accurately run to the positions of the outlet conveying parts, and finally are conveyed to the loading units of the branch goods machine through the outlet conveyor belts 5-1, 5-2, 5-3 and 5-4 on the outlet conveying parts. The outlet motors 6-1, 6-2, 6-3 and 6-4 are electrically connected with the centralized control part after being connected in parallel.
The above description is only a preferred embodiment of the present invention, and the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings. Any insubstantial modifications, adaptations, and improvements made within the spirit and framework of the proposed method are intended to be covered by the scope of the invention.
Claims (8)
1. A rapid cargo loading system of a branch cargo aircraft with multiple loading units is characterized by comprising an entrance conveying part, a scanning and measuring part, a centralized control part, a code pasting part, a code scanning part, a pushing part and an exit conveying part, wherein,
the entrance conveying part is used for carrying the random cargo to a preset position and then conveying the random cargo to the position of the scanning measuring part;
the scanning measurement part is used for scanning the geometric dimension and the weight of the random goods and transmitting the data obtained by scanning to the centralized control part;
the centralized control part generates information bar codes of random cargos, generates a cargo standardized loading model and a loading unit model through data obtained by scanning, then generates a final cargo loading scheme, and controls the working states of the inlet conveying part, the pushing part, the code scanning part and the outlet conveying part;
the code pasting part pastes corresponding bar codes to the random goods after receiving the scanning information about the random goods in the centralized control part;
the code scanning part is used for scanning the random goods with the pasted codes from the code pasting part according to the final goods loading scheme;
the pushing part is used for pushing the random goods after code scanning to the position of the outlet conveying part, and the pushing part is arranged in one-to-one correspondence with the code scanning part and the outlet conveying part;
the outlet conveying part is used for conveying the pushed random cargos to an outlet position, and the outlet position is connected with the loading unit.
2. The system for rapidly loading the random cargoes of the branch cargo aircraft with the multiple loading units as claimed in claim 1, wherein the inlet conveying part comprises an inlet conveyor belt, an endless conveyor belt and a driving running motor; and a safety distance S is arranged between one end of the inlet conveyor belt, which is far away from the circulating conveyor belt, and the circulating conveyor belt.
3. The system for rapidly loading the random cargo of the multi-loading unit of the branch cargo aircraft as claimed in claim 1, wherein the scanning and measuring part comprises a geometric dimension scanning system and a cargo weighing system, wherein the geometric dimension scanning system is used for scanning the geometric dimension of the random cargo, and the cargo weighing system is used for measuring the weight of the random cargo; the geometric dimension scanning system and the cargo weighing system are both electrically connected with the centralized control system; the distance between the scanning measuring part and the code pasting part is M.
4. The system as claimed in claim 1, wherein the centralized control part comprises a controller and a computer, and the computer is used for receiving, storing, transmitting data, generating a three-dimensional model, and performing logic operations.
5. The system for rapidly loading the random cargoes of the branch cargo aircraft with the multiple loading units according to claim 1, wherein the code pasting part comprises a bar code pasting machine, and the code pasting machine is electrically connected with the centralized control part; the distance between the code scanner and the pushing part is L; the code scanning part comprises a bar code scanner which is connected with the pushing part through an electric signal; the installation heights of the code scanning part and the code pasting part are consistent; the minimum value of the geometric dimension of the random goods is 1.5 times larger than the maximum value of the geometric dimension of the bar code of the code pasting part; the code scanning parts are arranged along the interval of the circulating conveyor belt and are four.
6. The system for rapidly loading the random cargoes of the branch cargo aircraft with the multiple loading units according to claim 1, wherein the pushing part comprises a pushing conveyor belt and a driving motor corresponding to the pushing conveyor belt, and the driving motor is electrically connected with the centralized control part; the propelling movement portion sets up along the endless conveyor interval to establish to four, and all set up the inboard at endless conveyor.
7. The system for rapidly loading the random cargoes of the branch cargo aircraft with the multiple loading units according to claim 1, wherein the outlet conveying part comprises an outlet conveyor belt and an outlet motor, and the outlet motor is electrically connected with the centralized control part; the outlet conveying parts are four in number, arranged at intervals and arranged on the outer side of the circulating conveying belt.
8. The system for rapidly loading the random cargo on the branch cargo aircraft with the multiple loading units according to claim 2, wherein a safety distance S is provided between the end of the entrance conveyor belt far away from the endless conveyor belt and the endless conveyor belt, and S is 1.2 XV 1 XN, where N is a characteristic length of the scanning portion in the direction of the endless conveyor belt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020494471.3U CN212009605U (en) | 2020-04-08 | 2020-04-08 | Random cargo rapid loading system with multiple loading units for branch cargo aircraft |
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| CN202020494471.3U CN212009605U (en) | 2020-04-08 | 2020-04-08 | Random cargo rapid loading system with multiple loading units for branch cargo aircraft |
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