Variable volume expansion intermodal container

Abstract

The application relates to a variable-volume expansion intermodal container, belonging to the intermodal container technical field, which comprises a bottom plate and a top plate, two folding plates are rotationally installed between the top surface of the bottom plate and the bottom surface of the top plate, box front covers and box rear covers are fixedly installed on the front and back surfaces of the bottom plate and the top plate through bolts, a plurality of reinforcing ribs are rotationally installed on the upper surfaces of the opposite surfaces of the two folding plates, three fastening assemblies are arranged on the surfaces of the reinforcing ribs, the fastening assembly comprises arc insertion strips fixedly installed on the opposite surfaces of the reinforcing ribs, the folding plates are folded inward, the overall height is significantly reduced in the empty container state, the transportation space occupation is reduced, the cabin utilization rate of the ship, the train and the truck is effectively improved, the return transportation cost is saved, the device can be combined and fixed through the detachable box front cover and the box rear cover, the capacity of the device is increased, and the expansion effect of the overall device is ensured.

Description

Technical Field

[0001] This invention relates to the field of intermodal container technology, specifically to a variable-volume expandable intermodal container. Background Technology

[0002] Intermodal containers are the core storage structure of modern logistics. They are standardized metal boxes that can be seamlessly transferred between different modes of transport, such as road, rail, and sea, without the need to open or reload the goods inside.

[0003] Traditional shipping containers have a fixed volume, and when empty containers are returned, they still occupy a full transport space, resulting in wasted transport capacity and high costs. Furthermore, traditional containers are basically fixed structures, making it impossible to store and transport some larger items.

[0004] To address the aforementioned issues, we propose a variable-volume extended intermodal container. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a variable-volume expandable intermodal container. The device significantly reduces the overall height of the container when empty by using inward-folding panels, thereby reducing the space occupied during transportation and effectively improving the utilization rate of cargo space on ships, trains, and trucks, saving return transport costs. Furthermore, the device can be combined and fixed using detachable front and rear covers to increase the capacity of the device, thus ensuring the overall expandability of the device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a variable volume expandable intermodal container, comprising a bottom plate and a top plate, wherein two folding plates are rotatably installed between the top surface of the bottom plate and the bottom surface of the top plate, and a front cover and a rear cover are respectively fixedly installed on the front and rear sides of the bottom plate and the top plate by bolts, and a plurality of reinforcing ribs are rotatably installed on the upper sides of the two folding plates opposite to each other, and each of the plurality of reinforcing ribs is provided with three fastening components on its surface; The fastening assembly includes arc-shaped inserts fixedly installed on opposite sides of the reinforcing ribs. Each arc-shaped insert has a snap-fit ​​groove on its surface. The inner walls of each snap-fit ​​groove are fixedly fitted with a first semi-circular groove post. The end of the arc-shaped insert near the snap-fit ​​groove has a recessed circular groove. A second semi-circular groove post is fixedly installed on one side of the inner wall of each of the two circular grooves. Rectangular openings are provided on the upper and lower sides of each arc-shaped insert on one side of the inner wall of the second semi-circular groove post. Locking components are provided on the top of each snap-fit ​​groove on the upper side of the inner wall of the first semi-circular groove post.

[0007] Furthermore, the folding panel includes two combined panels. The opposite sides of the two combined panels are rotatably connected to the top surface of the bottom plate and the bottom surface of the top plate, respectively. The opposite sides of the two combined panels are rotatably connected to each other. Sealing rubber plates are fixedly installed at the rotatable connection points of the two combined panels and at the connection points with the top and bottom plates to ensure the sealing effect of the gaps in the combined panels during folding, so as to avoid affecting the internal items. The folding rotation direction of the combined panels is inward, so that the bottom plate and the top plate tend to approach each other. The bottom plate, the top plate, and the folding panel can be combined in pairs, and then the front cover and the rear cover of the box can be combined to realize the volume expansion of the overall device. By using the folding of the folding panel, the device can be retracted in the empty box state, reducing space occupation and ensuring the overall green use effect.

[0008] Furthermore, the front cover of the container is a frame structure with a container door inside, and the rear cover of the container is a sealed plate to ensure the overall sealing effect at the rear.

[0009] Furthermore, multiple reinforcing ribs are rotatably mounted on the upper combination plate, and the reinforcing ribs on the two folding plates are relatively staggered; after the folding plates are folded, the reinforcing ribs are squeezed and rotated upwards. The staggered distribution structure can prevent the reinforcing ribs from obstructing each other.

[0010] Furthermore, the surfaces of the two corresponding snap-fit ​​blocks are fixedly connected to the surface of the combined plate. The surfaces of the upper and lower combined plates are respectively fixed with two snap-fit ​​blocks and four snap-fit ​​blocks to ensure that the reinforcing ribs can be snapped and fixed to the upper and lower combined plates, thereby ensuring the stability of the folded plate after it is unfolded.

[0011] Furthermore, the first semicircular groove post and the second semicircular groove post can be combined to form a circular column, and a rectangular hole structure is formed on the surface of the circular column. The rectangular opening is adapted to the rectangular hole after combination, and the position of the second semicircular groove post is complementary to the position of the first semicircular groove post.

[0012] Furthermore, the locking assembly includes a telescopic groove formed on the top of the snap-fit ​​block, a magnetic suction groove formed on the side of the top of the snap-fit ​​block away from the telescopic groove, a magnetic ring fixedly installed on the lower side inside the telescopic groove, and a connecting iron block fixedly installed on the lower side of the inner wall of the magnetic suction groove. Several connecting iron wires are fixedly installed between the magnetic ring and the connecting iron block. A permanent magnet is provided on the lower side of the inner wall of the magnetic suction groove, and a plug rod is slidably installed inside the telescopic groove.

[0013] Furthermore, several of the connecting wires are embedded inside the snap-fit ​​slot, and both the snap-fit ​​slot and the arc insert are made of austenitic stainless steel. The top of the permanent magnet is provided with a pull head.

[0014] Furthermore, the insertion rod consists of a rectangular vertical rod, a sliding disk, and two magnetic rings. The two magnetic rings are fixedly installed on the upper and lower surfaces of the sliding disk, and the rectangular vertical rod is fixedly connected to the bottom of the sliding disk. Both the rectangular vertical rod and the sliding disk are made of austenitic stainless steel. The rectangular vertical rod is adapted to the rectangular opening and is located on one side inside the first semi-circular groove, allowing it to be smoothly inserted into the interior of the first semi-circular groove. The lower end of the rectangular vertical rod extends through into the interior of the snap-fit ​​groove block.

[0015] Furthermore, a top cavity is formed on the lower side of the interior of several of the snap-fit ​​slot blocks. A limiting plate is slidably installed inside the top cavity, and a rectangular top rod is fixedly installed inside the limiting plate. The rectangular top rod is adapted to the rectangular opening and is located on one side inside the first semi-circular slot column, so that it can be smoothly inserted into the interior of the first semi-circular slot column. The upper end of the rectangular top rod extends through into the interior of the snap-fit ​​slot block, and the lower end of the rectangular top rod extends through into the bottom surface of the snap-fit ​​slot block. In this way, when it is necessary to release the snap-fit ​​between the snap-fit ​​slot block and the arc insert, the insert can be pushed out by the rectangular top rod and pulled out by the magnetic attraction of the permanent magnet, thereby ensuring the contact snap-fit ​​effect of the semi-circular slot column structure and facilitating the folding of the folding plate.

[0016] Compared with the prior art, the present invention provides a variable-volume expandable intermodal container, which has the following advantages: 1. The device significantly reduces the overall height of the empty container by using inward-folding panels, thereby reducing the space occupied during transportation and effectively improving the utilization rate of cargo space on ships, trains, and trucks, saving return transport costs. Furthermore, the device can be combined and fixed using detachable front and rear covers, increasing the capacity of the device and ensuring the overall expansion effect of the device.

[0017] 2. This device utilizes reinforced ribs to bridge the folding plates on both sides, and the interlocking structure of the cylindrical and rectangular holes of the arc insert and the snap-fit ​​groove block forms a multi-point mechanical locking, which significantly improves the resistance to lateral compression compared to traditional folding containers and prevents the container from bulging and deforming.

[0018] 3. The device uses a magnetic locking component driven by a permanent magnet. It automatically locks when the magnet is placed in and unlocks when the magnet is removed and the rectangular top rod is pushed. The entire process is manually operated and requires no electricity, hydraulic or pneumatic power, making it suitable for environments without electricity, such as storage yards and ship decks.

[0019] 4. All rotating joints of the device are equipped with sealing rubber plates, and together with the integrated rear cover, the entire box has excellent waterproof and dustproof performance, effectively preventing rainwater and dust from entering. Attached Figure Description

[0020] Figure 1 This is a perspective view of the entire invention; Figure 2 This is a three-dimensional view of the entire invention. Figure 3 This is a three-dimensional view of the entire folded structure of the present invention; Figure 4 This is an extended perspective view of the overall assembly of the present invention; Figure 5 This is a cross-sectional perspective view of the entire invention; Figure 6 This is a longitudinal sectional perspective view of the present invention; Figure 7 This is a perspective view of the reinforcing ribs of the present invention; Figure 8 for Figure 7 Enlarged structural diagram of section A in the middle; Figure 9 This is a three-dimensional view of the rectangular vertical bar cross-section of the present invention; Figure 10 This is a perspective view of the arc insert of the present invention.

[0021] In the diagram: 1. Bottom plate; 2. Top plate; 3. Folding plate; 301. Combined plate; 302. Sealing rubber plate; 4. Front cover; 401. Container door; 5. Rear cover; 6. Reinforcing ribs; 7. Fastening assembly; 701. Arc insert; 702. Snap-fit ​​groove block; 703. First semi-circular groove post; 704. Circular groove; 705. Second semi-circular groove post; 706. Rectangular opening; 8. Locking assembly; 801. Telescopic groove; 802. Magnetic suction groove; 803. Magnetic guide ring; 804. Connecting iron block; 805. Connecting iron wire; 806. Permanent magnet; 8061. Pull head; 807. Insert rod; 8071. Rectangular vertical rod; 8072. Sliding plate; 8073. Magnetic suction iron ring; 9. Top cavity; 10. Limiting plate; 11. Rectangular top rod. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 10This embodiment of a variable-volume expandable intermodal container includes a rectangular bottom plate 1 and a top plate 2 with dimensions matching the bottom plate 1. A folding plate 3 is rotatably installed on the left and right sides along the length of the container between the top surface of the bottom plate 1 and the bottom surface of the top plate 2. The two folding plates 3 are mirror-symmetrical in structure. Each folding plate 3 consists of two composite plates 301. The lower edge of the lower composite plate 301 is rotatably connected to the top side of the bottom plate 1 via a hinge, and the upper edge of the upper composite plate 301 is rotatably connected to the bottom side of the top plate 2 via a hinge. Adjacent edges of the upper and lower composite plates 301 are also rotatably connected to each other via hinges. Sealing rubber plates 302 are fixedly installed at all rotatable connections to ensure the sealing of gaps in the folding plates 3 in their unfolded or folded states. The rotation direction of the folding plates 3 is configured to fold inwards into the container. When folded, the bottom plate 1 and the top plate 2 tend to approach each other, thereby reducing the overall height. The front cover 4 and the rear cover 5 of the container are detachably fixed to the front and rear sides of the bottom plate 1 and the top plate 2 respectively by bolts. The front cover 4 is a frame structure with a container door 401 in the middle for personnel and goods to enter and exit. The rear cover 5 is an integral sealed plate. Above the two opposite sides of the two folding plates 3, that is, on the inner side of the upper combined plate 301, several reinforcing ribs 6 are rotatably installed. The reinforcing ribs 6 on the two folding plates 3 are staggered to avoid mutual interference when folding. Each reinforcing rib 6 has three fastening components 7 on its surface. Each fastening component 7 includes an arc-shaped insert 701 fixedly installed on both sides of the reinforcing rib 6. Each arc-shaped insert 701 has a snap-fit ​​groove 702 slidably installed on its surface. The back of the snap-fit ​​groove 702 is fixedly installed on the inner side of the upper assembly plate 301. In this embodiment, two snap-fit ​​grooves 702 are fixed on the inner side of the upper assembly plate 301, and four snap-fit ​​grooves 702 are fixed on the inner side of the lower assembly plate 301, which correspond to the arc-shaped inserts 701 on the reinforcing rib 6 at different positions. The snap-fit ​​slot 702 has a groove inside that matches the shape of the arc insert 701. A first semi-circular groove post 703 is fixedly installed on the inner wall of the snap-fit ​​slot 702. The end of the arc insert 701, that is, the end that is inserted into the snap-fit ​​slot 702, is recessed inward to form a circular groove 704. A second semi-circular groove post 705 is fixedly installed on one side of the inner wall of the circular groove 704. When the arc insert 701 is fully inserted into the snap-fit ​​slot 702, the positions of the first semi-circular groove post 703 and the second semi-circular groove post 705 are complementary, and the two are exactly combined to form a complete cylinder. A through rectangular opening 706 is opened on the upper and lower sides of the arc insert 701 on one side of the inner wall of the second semi-circular groove post 705. The shape and size of the rectangular opening 706 match the rectangular hole formed by the combination of the first semi-circular groove post 703 and the second semi-circular groove post 705. At the top of each snap-fit ​​slot 702, a locking assembly 8 is provided. The locking assembly 8 includes a telescopic groove 801 opened at the top of the snap-fit ​​slot 702 and a magnetic suction groove 802 opened on the side of the top of the snap-fit ​​slot 702 away from the telescopic groove 801. A magnetic guide ring 803 is fixedly installed on the lower side inside the telescopic groove 801. A connecting iron block 804 is fixedly installed on the lower side of the inner wall of the magnetic suction groove 802. Between the magnetic guide ring 803 and the connecting iron block 804, a number of connecting iron wires 805 embedded in the snap-fit ​​slot 702 are fixedly installed. A permanent magnet 806 is removably placed inside the magnetic suction groove 802. The top of the permanent magnet 806 is provided with a pull head 8061. An insert rod 807 is slidably installed inside the telescopic groove 801. The insert rod 807 consists of a rectangular vertical rod 8071, a sliding disk 8072, and two magnetic iron rings 8073 fixedly installed on the upper and lower sides of the sliding disk 8072. The rectangular vertical rod 8071 is fixedly connected to the bottom of the sliding disk 8072. Its lower end extends out of the sliding disk 8072 in the initial state and extends into the interior of the snap-fit ​​groove block 702, directly opposite the rectangular opening 706. The shape of the rectangular vertical rod 8071 is adapted to the rectangular opening 706. In addition, a top cavity 9 is provided on the lower side inside each snap-fit ​​slot 702. A limiting plate 10 is slidably installed in the top cavity 9. A rectangular top rod 11 is fixedly installed on the limiting plate 10. The upper end of the rectangular top rod 11 extends into the interior of the snap-fit ​​slot 702 and is directly below the rectangular opening 706. The lower end of the rectangular top rod 11 extends through to the outside of the bottom surface of the snap-fit ​​slot 702. In this embodiment, all components, except for the permanent magnet 806 and the clearly marked magnetic materials, the magnetic ring 803, the connecting iron block 804, the connecting iron wire 805, and the magnetic iron ring 8073, are made of austenitic stainless steel to ensure that they are non-magnetic and corrosion-resistant.

[0024] The working principle of the above embodiments is as follows: When the device is in use, when it is necessary to expand the container from the retracted state and from the empty container transportation state to the fully loaded transportation state, the operator first removes the front cover 4 and the rear cover 5 of the container. Then, the bottom plate 1 and the top plate 2 are pulled outwards respectively, so that the two folding plates 3 gradually unfold from the inward folded "V" shape until the bottom plate 1, the top plate 2 and the two folding plates 3 together form a complete cuboid space. At this time, the distance between the bottom plate 1 and the top plate 2 reaches the maximum design value. During the unfolding of the folding plate 3, the reinforcing rib 6 installed on the inner side of the upper combination plate 301 rotates downward around its rotation axis. When the folding plate 3 is fully unfolded, the reinforcing rib 6 is in a vertical or nearly vertical state, and the arc insert 701 at its end is just aligned with and begins to be inserted into the snap-fit ​​groove 702 on the inner side of the lower combination plate 301 on the opposite side. As the arc insert 701 slides within the snap-fit ​​slot 702, the second semi-circular groove post 705 at the end of the arc insert 701 gradually approaches the first semi-circular groove post 703 within the snap-fit ​​slot 702. When fully inserted, the first semi-circular groove post 703 and the second semi-circular groove post 705 fit tightly together to form a complete cylinder. At the same time, the rectangular opening 706 on the arc insert 701 completely overlaps with the rectangular hole formed in the center of the cylinder, and the lower end of the rectangular vertical rod 8071 of the insert rod 807 directly above is also aligned with the rectangular opening 706. At this time, the operator places the permanent magnet 806 into the magnetic suction groove 802. The magnetic field of the permanent magnet 806 is transmitted to the magnetic ring 803 through the connecting iron block 804 and the embedded connecting iron wire 805. The magnetic ring 803 generates strong magnetism, attracting the magnetic iron ring 8073 at the lower end of the insertion rod 807. Under the action of magnetic force, the insertion rod 807 slides downward in the telescopic groove 801. The rectangular vertical rod 8071 at its bottom passes through the rectangular opening 706 and further passes through the rectangular hole formed by the combination of the first semi-circular groove post 703 and the second semi-circular groove post 705. Since the rectangular vertical rod 8071 is tightly fitted with the rectangular opening 706 and the rectangular hole, the arc insertion strip 701 is locked inside the snap-fit ​​groove block 702 and cannot be pulled out. At this time, the reinforcing rib 6 is firmly fixed between the two folding plates 3, which significantly enhances the structural strength and deformation resistance of the container side wall. Finally, the front cover 4 and the rear cover 5 of the container are reinstalled, and the container can be safely loaded with goods. When a container needs to be returned empty to save transport space, first open the container door 401 and enter the container. The operator uses the pull head 8061 to remove the permanent magnet 806 from the magnetic suction slot 802. Once the permanent magnet 806 is removed, the magnetic ring 803 loses its magnetism and the magnetic attraction to the insertion rod 807 disappears. The insertion rod 807 may still remain in the locked position under its own weight and needs to be actively unlocked. At this time, the operator pushes the rectangular top rod 11 under each fastening component 7. The rectangular top rod 11 rises and its upper end enters the snap-fit ​​slot 702, pressing against the lower end of the rectangular vertical rod 8071 of the insertion rod 807 and pushing it upward. The rectangular vertical rod 8071 completely exits from the rectangular opening 706 and the rectangular hole. The lock between the arc insertion bar 701 and the snap-fit ​​slot 702 is released. During the process of pushing out, the permanent magnet 806 can be placed on the telescopic slot 801. With the help of the magnetic attraction ring 8073, the insertion rod 807 is better pushed out. After all fastening components 7 are manually unlocked, the operator pushes the folding plate 3 inward, and the arc insert 701 slides smoothly out of the snap-fit ​​block 702. The folding plate 3 folds inward into the container, and the bottom plate 1 and the top plate 2 move closer to each other, significantly reducing the overall height or width of the container. Finally, the reduced-volume container body is bolted to the front cover 4 and the rear cover 5, which can then be used as an empty container for efficient stacking and transportation, greatly reducing return transportation costs. During the folding process, the reinforcing ribs 6 retract to the bottom of the top plate 2, preparing for the next assembly.

[0025] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A variable-volume expandable intermodal container, comprising a bottom plate (1) and a top plate (2), characterized in that: Two folding plates (3) are rotatably installed between the top surface of the bottom plate (1) and the bottom surface of the top plate (2). The front cover (4) and the rear cover (5) of the box are respectively fixed on the front and rear sides of the bottom plate (1) and the top plate (2) by bolts. Several reinforcing ribs (6) are rotatably installed on the upper sides of the two folding plates (3) opposite to each other, and three fastening components (7) are provided on the surface of each of the several reinforcing ribs (6). The fastening assembly (7) includes arc inserts (701) fixedly installed on opposite sides of the reinforcing rib (6), and each of the two arc inserts (701) has a snap-fit ​​groove block (702) slidably installed on its surface. Each of the two snap-fit ​​groove blocks (702) has a first semi-circular groove post (703) fixedly installed on its inner wall. Each of the arc inserts (701) has a recessed circular groove (704) at one end near the snap-fit ​​groove block (702), and each of the two circular grooves (704) has a second semi-circular groove post (705) fixedly installed on one side of its inner wall. Each of the two arc inserts (701) has a rectangular opening (706) on one side of the inner wall of the second semi-circular groove post (705). Each of the two snap-fit ​​groove blocks (702) has a locking assembly (8) on the top side of the inner wall of the first semi-circular groove post (703).

2. The variable-volume expandable intermodal container according to claim 1, characterized in that: The folding plate (3) includes two combined plates (301). The opposite sides of the two combined plates (301) are rotatably connected to the top surface of the bottom plate (1) and the bottom surface of the top plate (2), respectively. The opposite sides of the two combined plates (301) are rotatably connected to each other. Sealing rubber plates (302) are fixedly installed at the rotatable connection positions of the two combined plates (301) and at the connection positions with the top plate (2) and the bottom plate (1).

3. The variable-volume expandable intermodal container according to claim 1, characterized in that: The front cover (4) of the container is a frame structure with a container door (401) inside, and the rear cover (5) of the container is a sealed plate.

4. The variable-volume expandable intermodal container according to claim 2, characterized in that: Multiple reinforcing ribs (6) are rotatably mounted on the upper combination plate (301), and the reinforcing ribs (6) on the two folding plates (3) are distributed in a relatively staggered manner.

5. A variable-volume expandable intermodal container according to claim 2, characterized in that: The surfaces of the two corresponding snap-fit ​​blocks (702) are fixedly connected to the surface of the combination plate (301), and the surfaces of the upper and lower combination plates (301) are respectively fixed with two snap-fit ​​blocks (702) and four snap-fit ​​blocks (702).

6. The variable-volume expandable intermodal container according to claim 1, characterized in that: The first semicircular groove column (703) and the second semicircular groove column (705) can be combined to form a circular column, and a rectangular hole structure is formed on the surface of the circular column. The rectangular opening (706) is adapted to the rectangular hole after combination. The position of the second semicircular groove column (705) is complementary to the position of the first semicircular groove column (703).

7. The variable volume expandable intermodal container according to claim 1, characterized in that: The locking assembly (8) includes a telescopic groove (801) opened on the top of the snap-fit ​​block (702). A magnetic suction groove (802) is opened on the side of the top of the snap-fit ​​block (702) away from the telescopic groove (801). A magnetic ring (803) is fixedly installed on the lower side inside the telescopic groove (801). A connecting iron block (804) is fixedly installed on the lower side of the inner wall of the magnetic suction groove (802). Several connecting iron wires (805) are fixedly installed between the magnetic ring (803) and the connecting iron block (804). A permanent magnet (806) is provided on the lower side of the inner wall of the magnetic suction groove (802). A plug rod (807) is slidably installed inside the telescopic groove (801).

8. A variable-volume expandable intermodal container according to claim 7, characterized in that: Several of the connecting wires (805) are embedded inside the snap-fit ​​slot (702), and the snap-fit ​​slot (702) and the arc insert (701) are both made of austenitic stainless steel. The top of the permanent magnet (806) is provided with a pull head (8061).

9. A variable-volume expandable intermodal container according to claim 7, characterized in that: The insertion rod (807) consists of a rectangular vertical rod (8071), a sliding disk (8072), and two magnetic rings (8073). The two magnetic rings (8073) are fixedly installed on the upper and lower surfaces of the sliding disk (8072), and the rectangular vertical rod (8071) is fixedly connected to the bottom of the sliding disk (8072). Both the rectangular vertical rod (8071) and the sliding disk (8072) are made of austenitic stainless steel. The rectangular vertical rod (8071) is adapted to the rectangular opening (706) and is located on one side inside the first semi-circular groove (703). The lower end of the rectangular vertical rod (8071) extends through into the interior of the snap-fit ​​groove (702).

10. A variable-volume expandable intermodal container according to claim 7, characterized in that: A top cavity (9) is provided on the lower side inside several of the snap-fit ​​slot blocks (702). A limiting plate (10) is slidably installed inside the top cavity (9), and a rectangular top rod (11) is fixedly installed inside the limiting plate (10). The rectangular top rod (11) is adapted to the rectangular opening (706) and is located on one side inside the first semi-circular groove column (703). The upper end of the rectangular top rod (11) extends through to the inside of the snap-fit ​​slot block (702), while the lower end of the rectangular top rod (11) extends through to the bottom surface of the snap-fit ​​slot block (702).

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