Unmanned cargo transfer device and transfer method thereof

Abstract

The invention discloses an unmanned cargo transfer device, and relates to the technical field of cargo transfer, the unmanned cargo transfer device comprises an unmanned vehicle body, a base and a cargo box, the top of the unmanned vehicle body is fixedly connected with a limiting frame matched with the base, and the top of the base is fixedly connected with the cargo box. The invention further discloses an unmanned cargo transfer method. The method comprises the steps of cargo placement, cargo box space adjustment, cargo box placement and cargo box fixing. According to the cargo loading and unloading device, when the device is used for loading and unloading cargoes, only the first hydraulic rod needs to be started, and the cargo box can be disassembled and assembled without manual operation, so that the unmanned vehicle transfers other cargoes, and the cargoes in the cargo box are independently loaded and unloaded; the problem that due to the fact that the unmanned logistics vehicle is fixedly connected with the container, cargo loading and unloading need to be achieved on the logistics vehicle, and the use frequency and the cargo conveying efficiency of the unmanned logistics vehicle are affected is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field related to cargo transfer, and in particular to an unmanned cargo transfer device and a transfer method thereof. Background Art

[0002] With the rapid development of the e-commerce industry, the demand for sorting and transportation of goods such as express parcels has increased rapidly. In order to reduce the high labor costs that come with it, the use of small logistics vehicles such as unmanned logistics vehicles to transport goods has been increasingly used.

[0003] At present, the containers of unmanned logistics vehicles are generally fixed on the vehicle body to transport goods with the vehicle. With this type of container setting, cargo loading and unloading need to be done on the logistics vehicle, which is inefficient. In addition, since the vehicle body and the container are connected as one, a logistics vehicle can only be equipped with one container, which will also affect the frequency of use of the logistics vehicle and cause an increase in overall costs.

[0004] In the Chinese invention patent application number: CN202010863986.0, there is disclosed an unmanned logistics transport vehicle for convenient loading and unloading of goods, including a vehicle body and a cargo box, the cargo box is connected to the top of the vehicle body by a connecting mechanism, a controller is provided on the outside of the vehicle body, a connecting frame is provided on the inside of the cargo box, a fixing frame is fixed on the bottom of one side of the connecting frame, and support blocks are fixed on both sides of the inside of the fixing frame. The unmanned logistics transport vehicle for convenient loading and unloading of goods can connect or separate the worm and the screw tube, thereby making the disassembly and assembly process of the cargo box and the vehicle body more convenient, greatly improving the convenience of maintaining the cargo box and the vehicle body. However, the unmanned logistics transport vehicle for convenient loading and unloading of goods only compresses the top of the goods when fixing the goods inside the cargo box, which is inconvenient to fix the goods from multiple directions, resulting in poor cargo fixing effect.

[0005] Therefore, it is necessary to propose an unmanned cargo transfer device and a transfer method thereof to solve the above problems. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides an unmanned cargo transfer device and a transfer method thereof, which solves the problem that the unmanned logistics vehicle is fixedly connected to the cargo box, resulting in the need to load and unload cargo on the logistics vehicle, thereby affecting the use frequency and cargo transportation efficiency of the unmanned logistics vehicle, and the space inside the cargo box cannot be effectively adjusted in multiple directions according to the type of cargo and the cargo cannot be fixed in multiple directions.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] An unmanned cargo transfer device comprises an unmanned vehicle body, a base and a cargo box, the top of the unmanned vehicle body is fixedly connected to a limit frame adapted to the base, the top of the base is fixedly connected to the cargo box, the top of the unmanned vehicle body is provided with a movable groove, the interior of the movable groove is slidably connected to a movable frame, the interior of the movable groove is fixedly connected to a first hydraulic rod, a plurality of rotating drums are rotatably connected between inner walls on both sides of the cargo box, a sliding groove is provided on the top of the cargo box and is slidably connected to a splint, and a bidirectional screw rod is rotatably connected between the inner walls on both sides of the cargo box.

[0011] Optionally, the output shaft of the first hydraulic rod is fixedly connected to a connecting plate, both sides of the connecting plate are fixedly connected to movable plates, there are multiple movable frames, and the multiple movable frames are evenly distributed on both sides of the movable groove; the inside of the movable groove is rotatably connected to multiple gears, and the number of gears is equal to the number of movable frames; the side of the movable plate is fixedly connected to gear teeth matching the gears, and the side of the movable frame is fixedly connected to racks, and the multiple racks are respectively meshed and connected to multiple gears.

[0012] Optionally, the end of the movable frame away from the movable plate is fixedly connected to a first limit block, the end of the first limit block away from the movable frame passes through the limit frame and is slidably connected to the limit frame, and a limit groove adapted to the first limit block is provided on the side of the base.

[0013] Optionally, the top of the first limit block is fixedly connected to the second limit block, the side of the base is fixedly connected to the limit rod, the number of the limit rods is equal to the number of the second limit blocks, and the second limit block is provided with a through hole adapted to the limit rod.

[0014] Optionally, a plurality of rotating rods are provided on the side of the cargo box, and the number of the rotating rods is equal to the number of rotating drums. The plurality of rotating rods are respectively fixedly connected to the plurality of rotating drums. A first synchronous connecting rod is provided on the side of the cargo box, and the first synchronous connecting rod is rotatably connected to the plurality of rotating rods. A second motor is fixedly connected to the side of the cargo box, and the output shaft of the second motor passes through the cargo box and is fixedly connected to one of the rotating drums.

[0015] Optionally, the number of the bidirectional screw rods is two, and the two bidirectional screw rods are located at both ends of the cargo box; the number of the splints is two, and the two splints are respectively located at both ends of the bidirectional screw rod and are threadedly connected to the bidirectional screw rod; two turntables are provided on the side of the cargo box, and the two turntables are respectively fixedly connected to the two bidirectional screw rods; a second synchronous connecting rod is provided on the side of the turntable, and the two ends of the second synchronous connecting rod are respectively rotatably connected to the side edges of the two turntables; a first motor is fixedly connected to the side of the cargo box, and the output shaft of the first motor passes through the cargo box and is fixedly connected to one of the bidirectional screw rods.

[0016] Optionally, grooves are provided at both ends of the top of the base, a second hydraulic rod is fixedly connected to the inside of the groove of the base, the output shaft of the second hydraulic rod is fixedly connected to the lifting frame, a lower support frame is provided between two adjacent rotating drums, the bottom of the lower support frame is fixedly connected to the top of the lifting frame, an electric push rod is fixedly connected to the top of the cargo box, the output shaft of the electric push rod passes through the cargo box and is fixedly connected to a fixed plate, a plurality of upper support frames are fixedly connected to the bottom of the fixed plate, a through hole compatible with the upper support frame is provided inside the splint, and a cushion is fixedly connected to the bottom of the upper support frame and the top of the lower support frame.

[0017] A method for unmanned cargo transfer, comprising the following steps:

[0018] A: Cargo placement: When in use, open the cargo door of the cargo box, and then start the second motor. The second motor rotates one of the rotating drums, so that one of the rotating rods drives the first synchronous connecting rod to rotate, and then the first synchronous connecting rod drives the remaining rotating rods to rotate so that multiple rotating drums rotate, and then the cargo is placed on the top of the rotating drum and drives the cargo to move so that the cargo moves to the inside of the cargo box. Then, this operation can be repeated to place multiple cargoes inside the cargo box;

[0019] B: Cargo box space adjustment: After the cargo is placed, the second hydraulic rod is started, and the second hydraulic rod makes the lifting frame rise, so that the lower support frame rises and lifts the cargo to make the cargo separate from the rotating drum, and the first motor is started to rotate the bidirectional screw rods, and one of the bidirectional screw rods rotates, so that one of the turntables rotates, so that the other turntable drives the other bidirectional screw rod to rotate through the second synchronous connecting rod, and then the bidirectional screw rod moves the two clamping plates to clamp the two sides of the cargo, and after the two sides of the cargo are clamped, the electric push rod is started, and the output shaft of the electric push rod makes the fixed plate descend so that the upper support frame contacts the cargo and clamps and fixes the top of the cargo;

[0020] C: Cargo box placement: After the cargo is placed and fixed, the cargo box is connected to an external lifting device and lifted by the lifting device. The cargo box is placed on the top of the unmanned vehicle body so that the outer side of the base contacts the inner side of the limit frame to limit the position of the cargo box;

[0021] D: Fixing the cargo box: After the cargo box is placed, the first hydraulic rod is started to move the movable plate, thereby rotating the gear through the gear teeth on the side of the movable plate. After the gear rotates, the rack pushes the movable frame to move, and then the movable frame moves the first limit block and the second limit block. After the first limit block moves, it enters the interior of the limit groove. After the second limit block moves, the limit rod enters the internal through hole to complete the fixation of the cargo box. After that, the unmanned vehicle body drives the cargo box to move to complete the transfer of the goods.

[0022] (III) Beneficial effects

[0023] The present invention provides an unmanned cargo transfer device and a transfer method thereof, which have the following beneficial effects:

[0024] 1. The present invention, through the coordination among the limit frame, the base, the first limit block, the second limit block, the limit groove and the limit rod, can enable the device to complete the disassembly and assembly of the cargo box by only starting the first hydraulic rod when loading and unloading the goods without manual operation, so that the unmanned vehicle can transfer the remaining goods and load and unload the goods inside the cargo box separately, which effectively solves the problem that the unmanned logistics vehicle is fixedly connected to the cargo box, resulting in the need to load and unload the goods on the logistics vehicle, thereby affecting the use frequency of the unmanned logistics vehicle and the efficiency of cargo transportation.

[0025] 2. The present invention, through the cooperation between the clamping plate, the upper support frame and the lower support frame, can make the device adjust the space inside the cargo box according to the size of the goods to be transported when in use and clamp and fix the goods on both sides and up and down, which effectively solves the problem that the space inside the cargo box cannot be effectively adjusted in multiple directions according to the type of goods and the goods cannot be fixed in multiple directions.

[0026] 3. The present invention, through the coordination among the rotating drum, the rotating rod, the first synchronous connecting rod and the second motor, enables the device to automatically move the goods by placing the goods on the top of the rotating drum during loading and unloading, so that the goods are transferred to the inside of the cargo box or moved from the inside of the cargo box to the outside of the cargo box, thereby effectively solving the problem that some goods are heavy and the internal space of the cargo box is small during loading and unloading, making it inconvenient to place the goods in the deep of the cargo box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic axial view of the structure of the present invention;

[0028] Figure 2 It is a schematic axial view of the unmanned vehicle body of the present invention;

[0029] Figure 3 The structure of the present invention Figure 2 A magnified schematic diagram of point A;

[0030] Figure 4 It is a schematic axial view of the structural cargo box of the present invention;

[0031] Figure 5 It is a schematic axial cross-sectional view of the structural cargo box of the present invention;

[0032] Figure 6 It is a schematic side axial cross-sectional view of the structural cargo box of the present invention.

[0033] In the figure: 1. unmanned vehicle body; 2. base; 3. cargo box; 4. limit frame; 5. movable groove; 6. first hydraulic rod; 7. connecting plate; 8. movable plate; 9. gear; 10. movable frame; 11. rack; 12. first limit block; 13. second limit block; 14. limit groove; 15. limit rod; 16. second hydraulic rod; 17. lifting frame; 18. lower support frame; 19. cushion; 20. rotating drum; 21. rotating rod; 22. first synchronous connecting rod; 23. splint; 24. two-way screw rod; 25. turntable; 26. second synchronous connecting rod; 27. first motor; 28. electric push rod; 29. ​​fixed plate; 30. upper support frame; 31. second motor. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-4, an unmanned cargo transfer device comprises an unmanned vehicle body 1, a base 2 and a cargo box 3, the top of the unmanned vehicle body 1 is fixedly connected with a limit frame 4 adapted to the base 2, the top of the base 2 is fixedly connected with the cargo box 3, a movable groove 5 is provided on the top of the unmanned vehicle body 1, a mobile frame 10 is slidably connected inside the movable groove 5, a first hydraulic rod 6 is fixedly connected inside the movable groove 5, a plurality of rotating drums 20 are rotatably connected between the inner walls on both sides of the cargo box 3, a sliding groove is provided on the top of the cargo box 3 and a clamping plate 23 is slidably connected, a bidirectional screw rod 24 is rotatably connected between the inner walls on both sides of the cargo box 3, a connecting plate 7 is fixedly connected to the output shaft of the first hydraulic rod 6, and a mobile plate 8 is fixedly connected to both sides of the connecting plate 7, and the number of the mobile frames 10 is multiple, and the multiple mobile frames 10 are evenly distributed on both sides of the movable groove 5. The movable groove 5 is internally rotatably connected with a plurality of gears 9, and the number of gears 9 is equal to the number of movable frames 10. The side of the movable plate 8 is fixedly connected with gear teeth matching the gears 9, and the side of the movable frame 10 is fixedly connected with a rack 11, and the plurality of racks 11 are respectively meshed and connected with the plurality of gears 9. The end of the movable frame 10 away from the movable plate 8 is fixedly connected with a first limit block 12, and the end of the first limit block 12 away from the movable frame 10 passes through the limit frame 4 and is slidably connected to the limit frame 4. A limit groove 14 matching the first limit block 12 is provided on the side of the base 2, and a second limit block 13 is fixedly connected to the top of the first limit block 12. A limit rod 15 is fixedly connected to the side of the base 2, and the number of the limit rods 15 is equal to the number of the second limit blocks 13. A through hole matching the limit rod 15 is provided inside the second limit block 13.

[0037] After the cargo is placed and fixed, the cargo box 3 is connected to the external lifting device and the cargo box 3 is lifted by the lifting device and placed on the top of the unmanned vehicle body 1 so that the outer side of the base 2 contacts the inner side of the limit frame 4, thereby limiting the position of the cargo box 3. After the cargo box 3 is placed, the first hydraulic rod 6 is started to move the movable plate 8, thereby rotating the gear 9 through the gear teeth on the side of the movable plate 8. After the gear 9 rotates, the rack 11 pushes the movable frame 10 to move, and then the movable frame 10 moves the first limit block 12 and the second limit block 13. After the first limit block 12 moves, it enters the interior of the limit groove 14. After the second limit block 13 moves, the limit rod 15 enters the internal through hole to complete the fixation of the cargo box 3. This effectively solves the problem that the unmanned logistics vehicle is fixedly connected to the cargo box 3, resulting in the need to load and unload goods on the logistics vehicle, thereby affecting the use frequency and cargo transportation efficiency of the unmanned logistics vehicle.

[0038] Example 2

[0039] See also Figure 1 , 4, 5 and 6, this embodiment is further optimized on the basis of embodiment 1, specifically, a plurality of rotating rods 21 are provided on the side of the cargo box 3, the number of the rotating rods 21 is equal to the number of the rotating drums 20, and the plurality of rotating rods 21 are fixedly connected to the plurality of rotating drums 20, a first synchronous connecting rod 22 is provided on the side of the cargo box 3, the first synchronous connecting rod 22 is rotatably connected to the plurality of rotating rods 21, a second motor 31 is fixedly connected to the side of the cargo box 3, the output shaft of the second motor 31 passes through the cargo box 3 and is fixedly connected to one of the rotating drums 20, the number of the two-way screw rods 24 is two, the two two-way screw rods 24 are located at both ends of the cargo box 3, the number of the splints 23 is two, the two splints 23 are respectively located at both ends of the two-way screw rod 24 and are threadedly connected to the two-way screw rod 24, two turntables 25 are provided on the side of the cargo box 3, the two turntables 25 are respectively fixedly connected to the two two-way screw rods 24, a second synchronous connecting rod 26 is provided on the side of the turntable 25, and the second The two ends of the synchronous connecting rod 26 are respectively rotatably connected to the side edges of the two turntables 25, and a first motor 27 is fixedly connected to the side of the cargo box 3. The output shaft of the first motor 27 penetrates the cargo box 3 and is fixedly connected to one of the two-way screw rods 24. Grooves are provided at both ends of the top of the base 2, and a second hydraulic rod 16 is fixedly connected inside the groove of the base 2. The output shaft of the second hydraulic rod 16 is fixedly connected to the lifting frame 17. A lower support frame 18 is provided between two adjacent rotating drums 20, and the bottom of the lower support frame 18 is fixedly connected to the top of the lifting frame 17. An electric push rod 28 is fixedly connected to the top of the cargo box 3, and the output shaft of the electric push rod 28 penetrates the cargo box 3 and is fixedly connected to a fixed plate 29. The bottom of the fixed plate 29 is fixedly connected to multiple upper support frames 30. A through hole compatible with the upper support frame 30 is provided inside the splint 23, and a cushion 19 is fixedly connected to the bottom of the upper support frame 30 and the top of the lower support frame 18.

[0040] In this embodiment, the second hydraulic rod 16 is started, and the second hydraulic rod 16 causes the lifting frame 17 to rise, thereby raising the lower support frame 18 and lifting the goods to make the goods separate from the rotating drum 20, and the first motor 27 is started to rotate the bidirectional screw rods 24 therein, and after one of the bidirectional screw rods 24 rotates, one of the turntables 25 is rotated, so that the other turntable 25 drives the other bidirectional screw rod 24 to rotate through the second synchronous connecting rod 26, and then the bidirectional screw rod 24 causes the two clamping plates 23 to move and clamp the two sides of the goods. After the two sides of the goods are clamped, the electric push rod 28 is started, and the output shaft of the electric push rod 28 causes the fixing plate 29 to descend so that the upper support frame 30 contacts the goods and clamps and fixes the top of the goods. The problem that the space inside the cargo box 3 cannot be effectively adjusted in multiple directions according to the type of goods and the goods cannot be fixed in multiple directions is effectively solved. The second motor 31, the second motor 31 rotates one of the rotating drums 20, so that one of the rotating rods 21 drives the first synchronous connecting rod 22 to rotate, and then the first synchronous connecting rod 22 drives the remaining rotating rods 21 to rotate, so that multiple rotating drums 20 rotate, and then the goods are placed on the top of the rotating drum 20 and the rotating drum 20 drives the goods to move so that the goods move to the inside of the cargo box 3, and then this operation can be repeated to place multiple goods inside the cargo box 3, which effectively solves the problem that some goods are heavier and the internal space of the cargo box 3 is smaller during cargo loading and unloading, and it is inconvenient to place the goods deep in the cargo box 3.

[0041] See also Figure 1-6 The present invention also discloses an unmanned cargo transfer method, comprising the following steps:

[0042] A: Cargo placement: When in use, the cargo door of the cargo box 3 is opened, and then the second motor 31 is started. The second motor 31 rotates one of the rotating drums 20, so that one of the rotating rods 21 drives the first synchronous connecting rod 22 to rotate, and then the first synchronous connecting rod 22 drives the remaining rotating rods 21 to rotate, so that multiple rotating drums 20 rotate, and then the cargo is placed on the top of the rotating drum 20. The rotating drum 20 drives the cargo to move so that the cargo moves to the inside of the cargo box 3, and then this operation can be repeated to place multiple cargoes inside the cargo box 3;

[0043] B: Cargo box space adjustment: After the cargo is placed, the second hydraulic rod 16 is started, and the second hydraulic rod 16 makes the lifting frame 17 rise, so that the lower support frame 18 rises and lifts the cargo to make the cargo separate from the rotating drum 20, and the first motor 27 is started to rotate the bidirectional screw rods 24, and after one of the bidirectional screw rods 24 rotates, one of the turntables 25 is rotated, so that the other turntable 25 drives the other bidirectional screw rod 24 to rotate through the second synchronous connecting rod 26, and then the bidirectional screw rod 24 moves the two clamping plates 23 and clamps the two sides of the cargo. After the two sides of the cargo are clamped, the electric push rod 28 is started, and the output shaft of the electric push rod 28 makes the fixing plate 29 descend so that the upper support frame 30 contacts the cargo and clamps and fixes the top of the cargo;

[0044] C: Cargo box placement: After the cargo is placed and fixed, the cargo box 3 is connected to an external lifting device and lifted by the lifting device and placed on the top of the unmanned vehicle body 1 so that the outer side of the base 2 contacts the inner side of the limit frame 4, thereby limiting the position of the cargo box 3;

[0045] D: Fixing the cargo box: After the cargo box 3 is placed, the first hydraulic rod 6 is started to move the movable plate 8, so that the gear 9 is rotated through the gear teeth on the side of the movable plate 8. After the gear 9 rotates, the rack 11 pushes the movable frame 10 to move, and then the movable frame 10 moves the first limit block 12 and the second limit block 13. After the first limit block 12 moves, it enters the interior of the limit groove 14. After the second limit block 13 moves, the limit rod 15 enters the internal through hole to complete the fixation of the cargo box 3. After that, the unmanned vehicle body 1 drives the cargo box 3 to move to complete the transfer of the goods.

[0046] In summary, through the cooperation among the limit frame 4, the base 2, the first limit block 12, the second limit block 13, the limit groove 14 and the limit rod 15, the device can complete the disassembly and assembly of the cargo box 3 by only starting the first hydraulic rod 6 without manual operation when loading and unloading the goods, so that the unmanned vehicle can transfer the remaining goods and load and unload the goods inside the cargo box 3 separately, which effectively solves the problem that the unmanned logistics vehicle is fixedly connected to the cargo box 3, resulting in the need to load and unload the goods on the logistics vehicle, thereby affecting the use frequency and cargo transportation efficiency of the unmanned logistics vehicle. Through the cooperation among the splint 23, the upper support frame 30 and the lower support frame 18, the device can transfer the goods as needed when in use. The space inside the cargo box 3 is adjusted according to the size of the goods and the goods are clamped and fixed on both sides and up and down, which effectively solves the problem that the space inside the cargo box 3 cannot be effectively adjusted in multiple directions according to the type of goods and the goods cannot be fixed in multiple directions. Through the cooperation between the rotating drum 20, the rotating rod 21, the first synchronous connecting rod 22 and the second motor 31, the device can automatically complete the movement of the goods by placing the goods on the top of the rotating drum 20 when loading and unloading the goods, so that the goods are transferred to the inside of the cargo box 3 or moved from the inside of the cargo box 3 to the outside of the cargo box 3, which effectively solves the problem that some goods are heavier and the internal space of the cargo box 3 is smaller during loading and unloading, and it is inconvenient to place the goods deep in the cargo box 3.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An unmanned cargo transfer device, comprising an unmanned vehicle body (1), a base (2) and a cargo box (3), characterized in that: The top of the base (2) is fixedly connected to a limit frame (4) adapted to the base (2), the top of the base (2) is fixedly connected to a cargo box (3), the top of the unmanned vehicle body (1) is provided with a movable groove (5), the interior of the movable groove (5) is slidably connected to a movable frame (10), the interior of the movable groove (5) is fixedly connected to a first hydraulic rod (6), a plurality of rotating drums (20) are rotatably connected between the inner walls on both sides of the cargo box (3), a sliding groove is provided on the top of the cargo box (3) and is slidably connected to a clamping plate (23), and a bidirectional screw rod (24) is rotatably connected between the inner walls on both sides of the cargo box (3).

2. The unmanned cargo transfer device according to claim 1, characterized in that: The output shaft of the first hydraulic rod (6) is fixedly connected to a connecting plate (7), and both sides of the connecting plate (7) are fixedly connected to movable plates (8). There are multiple movable frames (10), and the multiple movable frames (10) are evenly distributed on both sides of the movable groove (5). The movable groove (5) is rotatably connected to multiple gears (9), and the number of the gears (9) is equal to the number of the movable frames (10). The side of the movable plate (8) is fixedly connected to gear teeth that match the gears (9). The side of the movable frame (10) is fixedly connected to a rack (11), and the multiple racks (11) are respectively meshed and connected to the multiple gears (9).

3. The unmanned cargo transfer device according to claim 2, characterized in that: The end of the movable frame (10) away from the movable plate (8) is fixedly connected to a first limit block (12); the end of the first limit block (12) away from the movable frame (10) passes through the limit frame (4) and is slidably connected to the limit frame (4); and a limit groove (14) adapted to the first limit block (12) is provided on the side surface of the base (2).

4. The unmanned cargo transfer device according to claim 3, characterized in that: The top end of the first limit block (12) is fixedly connected to a second limit block (13), the side of the base (2) is fixedly connected to a limit rod (15), the number of the limit rods (15) is equal to the number of the second limit blocks (13), and the second limit block (13) is provided with a through hole adapted to the limit rod (15) inside.

5. The unmanned cargo transfer device according to claim 1, characterized in that: A plurality of rotating rods (21) are provided on the side of the cargo box (3), the number of the rotating rods (21) is equal to the number of the rotating drums (20), and the plurality of rotating rods (21) are respectively fixedly connected to the plurality of rotating drums (20). A first synchronous connecting rod (22) is provided on the side of the cargo box (3), and the first synchronous connecting rod (22) is rotatably connected to the plurality of rotating rods (21). A second motor (31) is fixedly connected to the side of the cargo box (3), and an output shaft of the second motor (31) passes through the cargo box (3) and is fixedly connected to one of the rotating drums (20).

6. The unmanned cargo transfer device according to claim 5, characterized in that: The number of the bidirectional screw rods (24) is two, and the two bidirectional screw rods (24) are located at two ends of the cargo box (3). The number of the clamping plates (23) is two, and the two clamping plates (23) are respectively located at two ends of the bidirectional screw rod (24) and are threadedly connected to the bidirectional screw rod (24). Two turntables (25) are provided on the side of the cargo box (3), and the two turntables (25) are respectively fixedly connected to the two bidirectional screw rods (24). A second synchronous connecting rod (26) is provided on the side of the turntable (25), and the two ends of the second synchronous connecting rod (26) are respectively rotatably connected to the side edges of the two turntables (25). A first motor (27) is fixedly connected to the side of the cargo box (3), and the output shaft of the first motor (27) passes through the cargo box (3) and is fixedly connected to one of the bidirectional screw rods (24).

7. The unmanned cargo transfer device according to claim 6, characterized in that: Grooves are provided at both ends of the top of the base (2), a second hydraulic rod (16) is fixedly connected inside the groove of the base (2), the output shaft of the second hydraulic rod (16) is fixedly connected to a lifting frame (17), a lower support frame (18) is provided between two adjacent rotating drums (20), the bottom of the lower support frame (18) is fixedly connected to the top of the lifting frame (17), an electric push rod (28) is fixedly connected to the top of the cargo box (3), the output shaft of the electric push rod (28) passes through the cargo box (3) and is fixedly connected to a fixing plate (29), a plurality of upper support frames (30) are fixedly connected to the bottom of the fixing plate (29), a through hole matched with the upper support frame (30) is provided inside the clamping plate (23), and a soft pad (19) is fixedly connected to the bottom of the upper support frame (30) and the top of the lower support frame (18).

8. A method for unmanned cargo transfer, characterized in that: The following steps are involved: A: Cargo placement: When in use, the cargo door of the cargo box (3) is opened, and then the second motor (31) is started. The second motor (31) causes one of the rotating drums (20) to rotate, thereby causing one of the rotating rods (21) to drive the first synchronous connecting rod (22) to rotate. Then, the first synchronous connecting rod (22) drives the remaining rotating rods (21) to rotate, thereby causing multiple rotating drums (20) to rotate. Then, cargo is placed on the top of the rotating drum (20). The rotating drum (20) drives the cargo to move, thereby moving the cargo to the inside of the cargo box (3). Then, this operation can be repeated to place multiple cargoes in the inside of the cargo box (3); B: cargo box space adjustment: after the cargo is placed, the second hydraulic rod (16) is started, the second hydraulic rod (16) causes the lifting frame (17) to rise, thereby causing the lower support frame (18) to rise and lift the cargo to make the cargo separate from the rotating drum (20), and the first motor (27) is started to rotate the bidirectional screw rods (24), after one of the bidirectional screw rods (24) rotates, one of the turntables (25) is rotated, thereby causing the other turntable (25) to drive the other bidirectional screw rod (24) to rotate through the second synchronous connecting rod (26), and then the bidirectional screw rod (24) causes the two clamping plates (23) to move and clamp the two sides of the cargo, after the two sides of the cargo are clamped, the electric push rod (28) is started, the output shaft of the electric push rod (28) causes the fixing plate (29) to descend, thereby causing the upper support frame (30) to contact with the cargo and clamp the top of the cargo; C: Cargo box placement: After the cargo is placed and fixed, the cargo box (3) is connected to an external lifting device and the cargo box (3) is lifted by the lifting device and placed on the top of the unmanned vehicle body (1) so that the outer side of the base (2) contacts the inner side of the limit frame (4) to limit the position of the cargo box (3); D: Fixing the cargo box: After the cargo box (3) is placed, the first hydraulic rod (6) is activated to move the movable plate (8), thereby rotating the gear (9) through the gear teeth on the side of the movable plate (8). After the gear (9) rotates, the rack (11) pushes the movable frame (10) to move, and then the movable frame (10) moves the first limit block (12) and the second limit block (13). After the first limit block (12) moves, it enters the interior of the limit groove (14). After the second limit block (13) moves, the limit rod (15) enters the internal through hole to complete the fixing of the cargo box (3). After that, the unmanned vehicle body (1) drives the cargo box (3) to move to complete the transfer of the goods.

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