Robotic dog cargo box conveying matching structure and logistics distribution method thereof

Abstract

The invention discloses a matching structure for conveying a container by a robot dog. The matching structure comprises a base mounted on the robot dog, wherein an assembled container is mounted on the base; the base is provided with a limiting mechanism capable of stretching out and drawing back relative to the base. The limiting mechanism comprises a lifting mechanism installed in an operation cavity formed in the base, the lifting mechanism is in driving connection with a supporting block movably arranged in a lifting groove of the installation plate in a penetrating mode, the supporting block is connected with a limiting insertion block capable of stretching out and drawing back relative to the base, and a retracting and releasing gap is reserved between the limiting insertion block and the plate face of the base; a limiting bottom plate is arranged at the bottom of a container body of the assembled container, and a plurality of butt joint inserting grooves capable of being inserted into the limiting inserting blocks in a butt joint mode are formed in the bottom of the limiting bottom plate. The lifting mechanism stretches out and draws back to drive the limiting inserting block to be lifted or pressed downwards relative to the plate face of the base to adjust the distance of the retracting and releasing gap. According to the robot dog cargo box conveying matching structure and the logistics distribution method thereof, the distribution flexibility and adaptability are improved, and meanwhile the transfer stability is improved.

Description

Technical Field

[0001] This invention relates to the field of logistics technology, specifically to a supporting structure for a robot dog's cargo box and its logistics distribution method. Background Technology

[0002] Currently, mezzanine racking systems require elevators for loading and unloading, which is not only costly but also slow. To use the elevator efficiently, a large trolley of goods needs to be prepared for each load and unload, and then sorting is required afterward. Robotic dogs, with their ability to climb stairs, make it possible to transport small quantities of goods without elevators. However, current delivery structures mounted on robotic dogs typically use clamping blocks to achieve a gripping mechanism. While this gripping mechanism offers flexible operation, it suffers from instability in limiting the movement of goods on sloping surfaces or in delivery environments requiring height, leading to issues like loosening or slippage. Furthermore, the delivery capacity is limited by the opening and closing range of the grippers themselves. Summary of the Invention

[0003] This invention overcomes the shortcomings of the prior art and provides a supporting structure for a robot dog's cargo box and its logistics distribution method, which improves the flexibility and adaptability of distribution while also increasing the stability of transshipment.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a supporting structure for a robot dog transport cargo box, comprising: a base installed on the robot dog, on which an assembled cargo box is mounted; and a limiting mechanism that can extend and retract relative to the base is provided on the base; The limiting mechanism includes a lifting mechanism in the operating cavity inside the mounting base. A support block is driven and connected to the lifting mechanism and is movably inserted in the lifting groove of the mounting plate. A limiting block that can extend and retract relative to the base is connected to the support block, and a retraction gap is reserved between the limiting block and the plate surface of the base. The bottom of the assembled cargo box is equipped with a limiting base plate, and the bottom of the limiting base plate is equipped with several mating grooves that can be inserted into the limiting blocks. The lifting mechanism extends and retracts to raise or lower the limit block relative to the base plate, adjusting the gap between the extension and retraction; it raises the limit block to release the limit plate between the limit block and the base, or it lowers the limit block to limit the limit plate between the limit block and the mounting plate.

[0005] In a preferred embodiment of the present invention, the limiting insert and the supporting block form a T-shaped cross-section insert; the mating groove provided on the limiting base plate forms a T-shaped cross-section slot.

[0006] In a preferred embodiment of the present invention, a plurality of spaced-apart limit blocks are provided on the base, and each limit block is driven to a lifting mechanism provided at both ends through a support block.

[0007] In a preferred embodiment of the present invention, a plurality of intersecting docking grooves are provided on the limiting base plate, and the docking grooves are provided through the bottom surface of the limiting base plate.

[0008] In a preferred embodiment of the present invention, open connecting ends are respectively provided at both ends of the assembled cargo box, and the connecting ends are connected to the storage cavity of the assembled cargo box. Furthermore, the modular cargo box is equipped with a partition that can be opened and closed relative to the connecting end. The partition is used to block or isolate the connecting end of the modular cargo box.

[0009] In a preferred embodiment of the present invention, each end of the assembled cargo box is provided with an open connecting end, on which a docking block and a docking slot are respectively provided; The mating blocks on the connecting end of the modular cargo box can be inserted into the mating slots on the connecting end of another modular cargo box to form a combined cargo box. The partition can be pulled out to connect the storage cavities of the connected combined cargo boxes.

[0010] In a preferred embodiment of the present invention, the upper end face of the limiting insert is provided with a recessed guide groove, and a roller that can roll relative to the guide groove is defined in the guide groove, and at least part of the roller's curved surface protrudes out of the opening of the guide groove.

[0011] In a preferred embodiment of the present invention, the body of the assembled cargo box is provided with a pre-set partition slot communicating with the storage cavity, and the partition slot is embedded with a partition for sealing or separating the assembled cargo box.

[0012] And / or, rollers include one or more of balls, rollers, and wheels.

[0013] In a preferred embodiment of the present invention, a logistics distribution method for a robotic dog cargo box assembly structure is provided, comprising the following steps: The lifting mechanism in the base installed on the robot dog pushes the support block, causing the support block to lift relative to the base, widening the retraction gap. At this time, the assembled cargo box mates with the limit block on the base installed on the robot dog through the docking groove set on the bottom limit plate until it is in the required position. Then, the lifting mechanism retracts the support block, causing the support block to retract relative to the base, narrowing the retraction gap. The limit block presses the protruding edge of the docking groove at the bottom of the assembled cargo box against the base, thus achieving the limit locking of the assembled cargo box.

[0014] In a preferred embodiment of the present invention, a logistics and distribution method for a robotic dog transport cargo box assembly structure is provided. The assembled cargo box is connected to another assembled cargo box by connecting end of the end through a docking block and docking slot. The two assembled cargo boxes are connected by opening the partition on the docking end of the assembled cargo box, so that the storage cavity of the connected assembled cargo box is connected. And / or, the rollers that are movable within the guide groove of the limiting insert block contact the inner wall of the mating groove provided on the limiting base plate of the assembled cargo box; And / or, the assembled cargo box has an L-shaped structure.

[0015] This invention addresses the deficiencies in the technical background, and the beneficial technical effects of this invention are: The present invention provides a supporting structure for a robot dog transport box and its logistics distribution method, which improves the flexibility and adaptability of distribution while also increasing the stability of transshipment.

[0016] By setting up a lifting mechanism to drive the limit block to rise and fall, the assembled cargo box is moved and connected. The lifting mechanism then drives the limit block to fall, confining the assembled cargo box to the base. Conversely, the assembled cargo box is released when it falls.

[0017] The modular cargo box has connecting ends at both ends that communicate with the storage cavity of the modular cargo box. On the one hand, goods are loaded through the connecting ends, and on the other hand, the connecting ends can be connected to the connecting ends of other modular cargo boxes to expand the storage cavity. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the disassembly of the supporting structure for the transport box of a robot dog according to the present invention. Figure 1 ; Figure 2 for Figure 1 A schematic diagram of the enlarged end structure of the middle limiting mechanism; Figure 3 This is a schematic diagram of the assembled cargo box in the supporting structure of a robot dog transport cargo box of the present invention; Figure 4 This is a front view of the assembled cargo box in the supporting structure for transporting a robot dog according to the present invention, when it is disassembled. Figure 5 This is a front view schematic diagram of the assembly structure of the modular cargo box in the supporting structure for transporting a robot dog according to the present invention. Figure 6 This is a schematic diagram of the limiting mechanism in the supporting structure of a robot dog transport box according to the present invention. Figure 1 ; Figure 7This is a schematic diagram of the disassembly of the supporting structure for the transport box of a robot dog according to the present invention. Figure 2 ; Figure 8 for Figure 7 Schematic diagram of the method structure in Part B; Figure 9 This is a schematic diagram of the limiting mechanism in the supporting structure of a robot dog transport box according to the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the limiting mechanism in the supporting structure of a robot dog transport box according to the present invention. Figure 3 ; Figure 11 for Figure 10 Enlarged structural diagram of section C; The components include: 1. Base; 11. Mounting plate; 12. Lifting groove; 2. Limiting mechanism; 21. Lifting mechanism; 211. Lifting drive component; 212. Push-pull rod; 213. Support plate; 214. Mounting seat; 215. Guide rail; 22. Support block; 23. Limiting insert; 231. Guide groove; 232. Roller; 233. Sealing plate; 3. Retraction gap; 4. Assembled cargo box; 41. Limiting base plate; 411. Docking groove; 42. Connecting end; 421. Docking insert; 422. Docking slot; 5. Partition; 51. Separating slot. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention and therefore only show the components relevant to the present invention.

[0021] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in the embodiments of the present invention, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0022] Example 1, as Figures 1-4As shown, a supporting structure for a robot dog transport cargo box includes: a base 1 installed on the robot dog, on which an assembled cargo box 4 is installed; and a limiting mechanism 2 that can extend and retract relative to the base 1 is provided on the base 1.

[0023] Specifically, the limiting mechanism 2 includes a lifting mechanism 21 located in the operating cavity within the mounting base 1. A support block 22 is driven and connected to the lifting mechanism 21, which is movably inserted into the lifting groove 12 of the mounting plate 11. A limiting insert 23, which can extend and retract relative to the base 1, is connected to the support block 22, and a retraction gap 3 is reserved between the limiting insert 23 and the surface of the base 1. The limiting insert 23 and the support block 22 form a T-shaped cross-section insert. Furthermore, the base 1 is provided with several spaced-apart limiting inserts 23, and the lower part of each limiting insert 23 is driven and connected to the lifting mechanism 21, which is spaced at both ends, via the support block 22. The number and spacing of the limiting inserts 23 can be adjusted according to actual usage requirements and are not further limited here, as long as they basically meet and conform to the shape and size of the assembled cargo box 4.

[0024] Specifically, the bottom of the assembled cargo box 4 is provided with a limiting base plate 41, and the bottom of the limiting base plate 41 is provided with several mating grooves 411 that can be inserted into the limiting plug 23. The mating grooves 411 provided on the limiting base plate 41 form a slot with a T-shaped cross-section structure.

[0025] Furthermore, the lifting mechanism 21 extends and retracts to raise or lower the limiting block 23 relative to the base 1, adjusting the spacing of the retraction gap 3; causing the limiting block 23 to rise and release the limiting base plate 41 between the limiting block 23 and the base 1, or causing the limiting block 23 to press down to limit the limiting base plate 41 between the limiting block 23 and the mounting plate 11.

[0026] Example 2, as Figures 1-5 As shown, based on Embodiment 1, the limiting base plate 41 of the assembled cargo box 4 is provided with a plurality of intersecting docking grooves 411, and the docking grooves 411 are provided through the bottom surface of the limiting base plate 41. In this embodiment, the limiting base plate 41 is provided with intersecting docking grooves 411.

[0027] Specifically, each lifting mechanism 21 includes a guide rail 215 installed in the operating cavity of the base 1 and a lifting drive component 211 located at one end of the guide rail 215. This embodiment uses a linear motor as described in the prior art, but is not limited to it. In other embodiments, a lifting cylinder as described in the prior art can also be used. A mounting base 214 is slidably arranged on the guide rail 215. The lifting drive component 211 is driven to connect a push-pull rod 212. One end of the push-pull rod 212 is connected to the mounting base 214, and the other end of the push-pull rod 212 is connected to the lifting drive component 211. The mounting base 214 is connected to one side of the support block 22 below the limiting plug 23. Both ends of each set of support blocks 22 and limiting plug 23 are driven to be installed in the operating cavity of the base 1 by the lifting mechanism 21. In this embodiment, a support plate 213 is also provided on the mounting base 214. The limiting plug 23 is installed on the support plate 213 of the mounting base 214 through the support block 22 at the bottom. Furthermore, the limiting plug 23 can adopt an integrated structure through the bottom support block 22.

[0028] Example 3, as Figures 1-5 As shown, based on Embodiment 1 or Embodiment 2, the two ends of the assembled cargo box 4 are respectively provided with open connecting ends 42, and the connecting ends 42 are connected to the storage cavity of the assembled cargo box 4; and the body of the assembled cargo box 4 is provided with a partition 5 that can be opened and closed relative to the connecting ends 42. The partition 5 is used to block or isolate the connecting ends 42 of the assembled cargo box 4. In this embodiment, the assembled cargo box 4 adopts an L-shaped structure, and the two ends of the L-shaped structure are connecting ends 42. The two ends of the assembled cargo box 4 are respectively provided with open connecting ends 42, which are respectively provided with mating blocks 421 and mating slots 422; the mating blocks 421 provided on the connecting ends 42 of the assembled cargo box 4 can be inserted into the mating slots 422 provided on the connecting ends 42 of another assembled cargo box 4 to form a combined cargo box. The partition 5 is pulled out to connect the storage cavities of the mated combined cargo boxes.

[0029] In Example 4, based on any one of Examples 1 to 3, the assembled cargo box 4 has a pre-set partition slot 51 that communicates with the storage cavity. The partition slot 51 is embedded with a partition 5 for sealing or separating the assembled cargo box 4.

[0030] Example 5, based on any one of Examples 1 to 4, such as Figures 6-9 As shown, the upper end face of the limiting insert 23 is provided with a recessed guide groove 231. A roller 232 that can roll relative to the guide groove 231 is defined inside the guide groove 231. At least part of the roller 232 protrudes out of the opening of the guide groove 231. The roller 232 is a rotatably connected to the guide groove 231.

[0031] Example 6, based on any one of Examples 1 to 4, such as Figure 10 , Figure 11 As shown, the upper end face of the limiting insert 23 is provided with a recessed guide groove 231. A roller 232, capable of rolling relative to the guide groove 231, is defined within the guide groove 231. At least a portion of the roller 232 protrudes beyond the opening of the guide groove 231. The roller 232 is a ball bearing rotatably connected to the guide groove 231. Furthermore, one end of the guide groove 231 into which the ball bearing is inserted is secured within the guide groove 231 by a mounting sealing plate 233.

[0032] In Example 7, based on any of Examples 1 to 4, the upper end face of the limiting insert 23 is provided with a recessed guide groove 231. A roller 232, capable of rolling relative to the guide groove 231, is defined within the guide groove 231. At least a portion of the roller 232 protrudes beyond the opening of the guide groove 231. The roller 232 is a rotatably connected roller within the guide groove 231. Furthermore, one end of the roller inserted into the guide groove 231 is constrained within the guide groove 231 by a mounting sealing plate 233.

[0033] Example 8: A logistics distribution method for a robot dog transport cargo box matching structure, implemented using the robot dog transport cargo box matching structure from any of Examples 1 to 7, including the following steps: The lifting mechanism 21 in the base 1 mounted on the robot dog pushes the support block 22, causing the support block 22 to lift the limiting plug 23 relative to the base 1, widening the retraction gap 3. At this time, the assembled cargo box 4 mates with the limiting plug 23 on the base 1 via the docking groove 411 on the bottom limiting plate 41 until it is in the required position. Then, the lifting mechanism 21 retracts the support block 22, causing the support block 22 to retract the limiting plug 23 relative to the base 1, narrowing the retraction gap 3. The limiting plug 23 presses the protruding edge of the docking groove 411 at the bottom of the assembled cargo box 4 against the base 1, achieving the limiting and locking of the assembled cargo box 4. During transportation, the status is adjusted according to the left and right balance weight distribution.

[0034] Example 9, based on Example 8, provides a logistics and distribution method for a robotic dog transport cargo box structure, comprising the following steps: The assembled cargo box 4 is connected to another assembled cargo box 4 via a connecting end 42, which is engaged by a mating block 421 and a mating slot 422. The two assembled cargo boxes 4 are then connected by opening the partition 5 on the mating connecting end 42 of the assembled cargo box 4, allowing the storage cavities of the connected assembled cargo boxes 4 to communicate. During transport, the cargo is positioned according to the left-right weight distribution.

[0035] Example 10, based on Example 8 or Example 9, provides a logistics distribution method for a robot dog transport cargo box structure, comprising the following steps: A roller 232, movable within the guide groove 231 of the limiting block 23, contacts the inner wall of the docking groove 411 provided on the limiting base plate 41 of the assembled cargo box 4. During transport, the status is adjusted according to the left-right balance weight distribution method.

[0036] Example 11, based on Example 8 or Example 9, provides a logistics distribution method for a robot dog transport cargo box structure, comprising the following steps: The assembled cargo box 4 is further assembled into a U-shaped structure and fixed to a limiting block 23 on the base 1 via a cross-shaped docking groove 411 at the bottom. The U-shaped assembled cargo box 4 can be longitudinally connected to a limiting block 23 on the base 1 via the longitudinally penetrating, straight-line docking groove 411. During transport, the cargo box is positioned according to the left-right balance weight distribution method.

[0037] But it is not limited to this. The U-shaped assembled cargo box 4 can also be horizontally connected to two limiting blocks 23 on the base 1 by a pair of parallel docking slots 411. On the one hand, it limits the position of the assembled cargo box 4 on the limiting blocks 23, and on the other hand, it first pushes the assembly limit between the assembled cargo box 4 and the assembled cargo box 4.

[0038] Example 12, based on any one of Examples 1 to 4, such as Figures 6-9 As shown, the mating plug 421 and the mating slot 422 are provided with through threaded holes. If necessary, the mating plug 421 and the mating slot 422 can be further connected and fixed after mating assembly by screwing screws or threaded rods.

[0039] Example 13, based on any one of Examples 1 to 4, such as Figures 6-9 As shown, the partition 5 can be movably inserted into the partition slot 51. When needed, threaded holes are provided at the end of the partition slot 51 and in the area extending beyond it. A threaded protrusion is provided on the outer edge of the partition slot 51, and a screw is used to lock the partition 5 and the threaded protrusion in place. Conversely, the threaded hole at the bottom of the partition 5 facilitates locking the pulled-out partition 5 and protrusion together with screws. To improve waterproofing, an O-ring is provided on the inner wall of the partition slot 51, and a sealing block is provided on the outer end of the partition 5, which adheres to the waterproof outer surface of the enclosure. Furthermore, when the partition 5 is removed, the waterproof sealing block can be embedded in the partition slot 51 to achieve water and air sealing. The specific structure only needs to meet the basic waterproofing requirements of existing technologies; specific waterproof sealing assembly structures are not limited here, as long as the most basic sealing and waterproofing are achieved.

[0040] Working principle: This invention discloses a robotic dog transport cargo box structure and its logistics distribution method. This structure and method improve the flexibility and adaptability of delivery while also increasing the stability of transshipment. A lifting mechanism drives a limit block to rise and fall, movably connecting the assembled cargo box. Conversely, the lifting mechanism drives the limit block to fall, confining the assembled cargo box to the base. Conversely, the lifting mechanism releases the assembled cargo box. Both ends of the assembled cargo box have connecting ends that communicate with its storage cavity. These connecting ends allow for loading goods and also enable assembly with other assembled cargo boxes to expand the storage cavity.

[0041] The above specific embodiments are specific support for the concept proposed in this invention, and should not be used to limit the scope of protection of this invention. Any equivalent changes or modifications made on the basis of this technical solution in accordance with the technical concept proposed in this invention shall still fall within the scope of protection of this invention.

Claims

1. A supporting structure for a robot dog's cargo box, comprising: A base (1) mounted on the robot dog; an assembled cargo box (4) is mounted on the base (1); characterized in that: The base (1) is provided with a limiting mechanism (2) that can extend and retract relative to the base (1); The limiting mechanism (2) includes a lifting mechanism (21) in the operating cavity provided in the mounting base (1). The lifting mechanism (21) is driven to connect a support block (22) that is movably inserted in the lifting groove (12) of the mounting plate (11). The support block (22) is connected to a limiting plug (23) that can extend and retract relative to the base (1). A retraction gap (3) is reserved between the limiting plug (23) and the plate surface of the base (1). The bottom of the assembled cargo box (4) is provided with a limiting base plate (41), and the bottom of the limiting base plate (41) is provided with several mating grooves (411) that can be inserted into the limiting plug (23). The lifting mechanism (21) extends and retracts to raise or lower the limit block (23) relative to the base (1) to adjust the gap (3) between the extension and retraction; the limit block (23) is raised to release the limit plate (41) between the limit block (23) and the base (1), or the limit block (23) is lowered to limit the limit plate (41) between the limit block (23) and the mounting plate (11).

2. The supporting structure for the robot dog transport box according to claim 1, characterized in that: The limiting insert (23) and the support block (22) form a T-shaped cross-section insert; the mating groove (411) provided on the limiting base plate (41) forms a T-shaped cross-section slot.

3. The supporting structure for the robot dog transport box according to claim 2, characterized in that: The base (1) is provided with a number of spaced limit blocks (23), and each limit block (23) is driven to be connected to the lifting mechanism (21) spaced at both ends via a support block (22).

4. The supporting structure for the robot dog transport box according to claim 3, characterized in that: The limiting base plate (41) is provided with a number of intersecting docking grooves (411), and the docking grooves (411) are provided through the bottom surface of the limiting base plate (41).

5. The supporting structure for the robot dog transport box according to claim 4, characterized in that: The assembled cargo box (4) is provided with open connecting ends (42) at both ends, and the connecting ends (42) are connected to the storage cavity of the assembled cargo box (4). Furthermore, the assembled cargo box (4) is provided with a partition (5) that can be opened and closed relative to the connecting end (42). The partition (5) is used to block or isolate the connecting end (42) of the assembled cargo box (4).

6. The supporting structure for the robot dog transport box according to claim 5, characterized in that: The assembled cargo box (4) is provided with open connecting ends (42) at both ends, and is provided with docking blocks (421) and docking slots (422) respectively. The mating plug (421) provided on the connecting end (42) of the assembled cargo box (4) can be inserted into the mating slot (422) provided on the connecting end (42) of another assembled cargo box (4) to form a combined cargo box. The partition (5) is pulled out to connect the storage cavity of the combined cargo box.

7. The supporting structure for the robot dog transport box according to claim 1, characterized in that: The upper end face of the limiting insert (23) is provided with a recessed guide groove (231), and a roller (232) that can roll relative to the guide groove (231) is defined in the guide groove (231). At least part of the roller (232) protrudes out of the opening of the guide groove (231).

8. The supporting structure for the robot dog transport box according to claim 1, characterized in that: The assembled cargo box (4) has a pre-set partition slot (51) that communicates with the storage cavity. The partition slot (51) is embedded with the partition plate (5) for sealing or separating the assembled cargo box (4). And / or, the roller (232) includes one or more of balls, rollers, and wheels; And / or, the assembled cargo box (4) has an L-shaped structure.

9. A logistics and distribution method for a robotic dog transport cargo box and its associated structure, characterized in that: The robot dog delivery box structure described in any one of claims 1-8 is used to implement the following steps: The lifting mechanism (21) in the base (1) installed on the robot dog pushes the support block (22), causing the support block (22) to lift the limit plug (23) relative to the base (1), thus widening the retraction gap (3). At this time, the assembled cargo box (4) is connected to the limit plug (23) on the base (1) installed on the robot dog through the docking groove (411) set on the bottom limit plate (41). After the connection is reached, the lifting mechanism (21) retracts the support block (22), causing the support block (22) to retract the limit plug (23) relative to the base (1), thus narrowing the retraction gap (3). The limit plug (23) presses the protruding edge of the docking groove (411) at the bottom of the assembled cargo box (4) against the base (1), thus achieving the limit locking of the assembled cargo box (4).

10. The logistics distribution method for a robotic dog transport cargo box matching structure according to claim 9, characterized in that: The assembled cargo box (4) is connected to the connecting end (42) of another assembled cargo box (4) through the connecting end (42) provided at the end, and the two assembled cargo boxes (4) are connected by the connecting block (421) and the connecting slot (422). By opening the partition (5) on the connecting end (42) of the assembled cargo box (4), the storage cavity of the connected assembled cargo box (4) is connected. And / or, the roller (232) that is movable within the guide groove (231) of the limiting insert (23) contacts the inner wall of the docking groove (411) provided on the limiting base plate (41) of the assembled cargo box (4).

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