A rear door structure for a rear-loading self-unloading freight container

Abstract

A rear door structure for a rear-loading self-unloading freight container, belonging to the field of transportation vehicles, includes a door frame, an upward-opening door, a downward-opening door, an upward-opening door hinge, and a downward-opening door pivot. The door frame is located at the rear end of the container body, and the rear surface of the door frame is flush with or recessed from the rear surface of the rear crossbeam of the frame vehicle. The upward-opening door is mounted on the door frame and is hinged to the upper crossbeam of the door frame via a hinge, and can swing around this hinge. It features smooth unloading and has the function of lifting material.

Description

Technical Field

[0001] This invention belongs to the field of transportation vehicles, and specifically relates to a rear door structure for a freight container used for bulk cargo transportation and having a rearward self-unloading function. Background Technology

[0002] Freight containers are a common and efficient means of transporting goods in the freight industry. They are characterized by good enclosure, flexibility, ease of loading and unloading, and relatively enclosed loading areas, leading to their widespread use in land, sea, air, and rail transport. During freight container transport, especially in bulk cargo transport, loading is largely automated using loading equipment. However, unloading hinders the efficiency of container transport. Therefore, freight containers with self-unloading capabilities have been developed. Existing self-unloading freight containers are generally divided into two types: side-tipping and rear-tipping. Side-tipping offers faster unloading speed and shorter lifting distance, but the closer unloading distance to the vehicle body can affect the vehicle's continued movement. Rear-tipping, on the other hand, does not affect vehicle movement after unloading and allows for concentrated unloading. However, when the container is long, the excessive lifting height can cause instability during unloading, creating safety hazards. Furthermore, to standardize the consistency and safety of freight vehicles, the government has introduced a series of regulations for freight transport. The relevant standards for vehicles and freight containers stipulate that any transport vehicles that do not meet national regulations are prohibited from being used on roads or engaged in transport work. This places higher demands on the realization of the self-unloading function of freight containers. For example, regarding tilting containers, to ensure road transport safety, regulations stipulate that the rear end of the container cannot extend beyond the frame of the skeleton vehicle after it is placed on it, thus preventing the safety of the driver and passengers of the following vehicle in the event of a rear-end collision. It is also stipulated that the container can only be placed on the skeleton vehicle and is not allowed to have a fixed connection with it, thus preventing unauthorized vehicle modifications. However, in practical applications, to prevent the container from being lifted too high during tilting, the container's placement position is moved back. This brings the fulcrum closer to the middle of the container during tilting, reducing the lifting height and completing the unloading. Furthermore, because the rear door of the container is a certain distance from the rear of the skeleton vehicle during tilting, it prevents unloaded goods from piling up near the wheels and causing congestion. However, this structure is not permitted by national standards, which increases the difficulty of realizing the self-unloading function of freight containers. Summary of the Invention

[0003] To address the contradiction between the functional structure and national standards of existing rear-dumping freight containers, which poses safety hazards in road transportation, this invention proposes a rear-dumping freight container that resolves the conflict between functional structure and national standards, and overcomes other application and safety issues associated with current rear-dumping freight containers. The specific technical solution is a rear-dumping freight container characterized by: the container comprising a body, a connecting frame, a rear door opening and closing device, a tilting bracket, a rear door, outer reinforcing ribs, inner reinforcing ribs, a lifting system, a front door, and a bottom; the body, mounted on the connecting frame, is an open-top cavity connected to the connecting frame via the tilting bracket; the connecting frame is installed below the body, with its rear end hinged to the body via the tilting bracket, and its front end locked together via a latch or hook; the lower part of the connecting frame is equipped with a locking bracket (lock box) corresponding to the frame vehicle, capable of engaging and locking with the locking pins on the frame vehicle; the rear door opening and closing device is installed at the rear end of the body, and its operation... The component is connected to the rear door and is a hydraulically driven automatic control opening and closing device, capable of automatically opening and closing the rear door. The flipping bracket is located between the box body and the connecting frame, and is connected to the rear of the box body and the rear of the connecting frame by a hinge. During unloading, the connecting frame remains stationary, and the box body swings around the flipping bracket to achieve the unloading function. The rear door is located at the rear of the box body and is a split structure, which is hinged to the door frame at the rear of the box body and can be opened by swinging backward. The outer reinforcing rib is located on the outside of the box body and is connected to the outside of the box body to enhance the strength of the box body. The inner reinforcing rib is located in the inner cavity of the box body and is connected to the box body. The lifting system is installed in the front cavity of the box body and the front support of the connecting frame. The partition located at the front of the inner cavity of the box body is isolated from the inner cavity of the box body and includes a power unit, a control unit, and a lifting unit. The front door is located at the front of the box body and can close the front of the inner cavity of the box body. The bottom is arc-shaped and smoothly connected to the two side walls of the box body. The connection between the rear end of the bottom and the flipping bracket is a plane, and this plane is higher than the bottom of the box body.

[0004] Furthermore, the cross-section of the box is U-shaped (the longitudinal direction is consistent with the vehicle's direction of travel, and the transverse direction is perpendicular to the vehicle's direction of travel).

[0005] Furthermore, there are multiple external reinforcing ribs, arranged longitudinally and parallel to each other on the outer surface of the box.

[0006] Furthermore, there are multiple internal reinforcing ribs arranged longitudinally within the inner cavity of the box, and each internal reinforcing rib is allowed to have a different pattern.

[0007] Furthermore, the lifting system is a hydraulic lifting system, using hydraulic cylinders as lifting components.

[0008] Furthermore, the aforementioned backdoor (reference) Figure 6The system includes a door frame, a top-opening door, a bottom-opening door, a top-opening door hinge, and a bottom-opening door pivot. The door frame is located at the rear end of the body, with its rear surface flush with or recessed from the rear surface of the frame's rear crossbeam. The top-opening door is mounted on the door frame and hinged to the top crossbeam, allowing it to swing around the hinge. The lower edge of the top-opening door has a latch plate that engages with the upper edge of the bottom-opening door, pressing the top-opening door firmly against the door frame when the bottom-opening door is engaged. The lower end of the bottom-opening door is mounted on a tilting bracket and swings around the tilting axis of the bracket, while its upper part is flush with the lower edge of the door frame. The door is fastened with a locking device to secure the bottom door to the door frame. The downward swing angle of the bottom door is less than 150°, so that the upper edge of the bottom door forms a platform or downward unloading platform at a distance from the rear of the skeleton vehicle, and the unloaded goods are thrown out instead of staying at the rear of the skeleton vehicle and causing congestion to the rear wheels of the skeleton vehicle. The hinge of the top door is installed between the upper crossbeam of the door frame and the upper edge of the top door, which can hinge the top door to the door frame. The bottom door flipping shaft is hollow and arc-shaped, and is fitted on the flipping shaft of the flipping bracket, which can swing around the flipping shaft of the flipping bracket.

[0009] Furthermore, the shape inside the door frame matches the shape at the rear of the box.

[0010] Furthermore, the aforementioned top-opening door includes an upper door frame and an upper door panel.

[0011] Furthermore, the bottom-opening door includes a bottom door frame and a bottom door panel, and the shape of the bottom-opening door composed of the bottom door frame and the bottom door panel matches the cross-sectional shape of the rear of the box.

[0012] Furthermore, the bottom-opening door is equipped with a bolt, which can press the bottom-opening door and the top-opening door tightly against the door frame.

[0013] Furthermore, the bottom-opening door pivot is composed of an arc-shaped plate and a pivot sleeve; the arc-shaped plate is installed at the bottom of the bottom-opening door and connected to the lower edge of the bottom-opening door, so as to seal the gap between the bottom-opening door pivot and the flipping frame when the bottom-opening door is closed, thus preventing loose goods from leaking out of this gap; the pivot sleeve is fitted on the flipping shaft of the flipping bracket, can rotate around the flipping shaft, and is connected to the lower edge of the bottom-opening door.

[0014] Furthermore, the arc-shaped plate includes an arc-shaped plate body and a limiting groove; the length of the arc-shaped plate body matches the length of the rotating shaft sleeve, and the radius of the inner arc of the arc-shaped plate matches the outer radius of the rotating shaft sleeve, allowing it to fit snugly against the outer circle of the rotating shaft sleeve; the thickness of the arc-shaped plate matches the distance from the rotating shaft sleeve to the upper surface of the crossbeam of the flip-up bracket, and when the arc-shaped plate rotates with the bottom opening door to close the bottom opening door, the thickness of the arc-shaped plate can seal the distance between the rotating shaft sleeve and the crossbeam of the flip-up bracket; the limiting groove is provided on the arc-shaped plate body, is an open groove shape, and has one or more; the width of the limiting groove matches the thickness of the connecting plate on the flip-up bracket, allowing the connecting plate to move within the groove; the number of limiting grooves is adapted to the number of connecting plates of the flip-up bracket within the bottom width of the bottom opening door.

[0015] Furthermore, the connecting frame includes a front support, a longitudinal beam, a weight-reducing structure, and a lower half of the tilting frame; the front support is located at the front end of the longitudinal beam and includes a front crossbeam and a lifting system component mounting bracket, connected to the longitudinal beam; the longitudinal beam is located between the front support and the lower half of the tilting frame, with both ends connected to the front support and the lower half of the tilting frame respectively; the longitudinal beam has a hollow structure; the transverse width of the longitudinal beam is less than one-third of the length of the lower half of the tilting frame; the weight-reducing structure is located on the longitudinal beam, is a perforated structure, distributed on the longitudinal beam, which can reduce the weight of the longitudinal beam while ensuring its strength; the lower half of the tilting frame is located at the tail of the longitudinal beam and is arranged perpendicular to the longitudinal beam; the length of the lower half of the tilting frame is consistent with the length of the rear crossbeam of the skeleton vehicle, and the rear edge of the tilting frame is located inside the skeleton vehicle, that is, the rear surface of the lower half of the tilting frame is flush with or recessed from the rear surface of the skeleton vehicle.

[0016] Furthermore, the tilting bracket includes a lower half and an upper half, which are hinged together by a tilting shaft. The upper half of the tilting bracket is installed at the bottom of the rear end of the box and includes side support plates, side bushings, a middle support plate, and a middle bushing. The side support plates are arranged on the sides of the box, with two pairs symmetrically distributed on both sides, and are connected to the side bushings. They can rotate together with the side bushings around the tilting shaft and are close to the support lugs on the lower half of the tilting bracket. The side bushings are fitted onto the tilting shaft, fixedly connected to the rear end of the box, and connected to the side support plates. When the box is tilted, they bear the weight of the box and the goods. The middle support plate is installed on the box, connected to the bottom of the rear end of the box, and also connected to the middle bushing. After the middle support plate is connected to the middle bushing, the hole of the middle bushing should be concentric with the hole of the side bushing. The middle bushing is fitted onto the tilting shaft and fixedly connected to the middle support plate. All the holes of the middle bushings are concentric.

[0017] Furthermore, there are two or more intermediate bushings; the diameter and length of each intermediate bushing may be the same or different.

[0018] Furthermore, the intermediate support plates are connected to the intermediate bushings in pairs or more, that is, each intermediate bushing is connected to two or more intermediate support plates at the same time.

[0019] Furthermore, the lower part of the flip-up bracket includes an upper locking box, a lower crossbeam, an inner seat, side seat holes, and an outer seat; the upper locking box is installed at both ends of the lower crossbeam and connected to the lower crossbeam; the upper locking box is provided with structural elements conforming to relevant national standards, such as locking pin holes; the lower crossbeam is installed between the two upper locking boxes, and its two ends are connected to the two upper locking boxes; the inner seat is located on the inner side of the upper locking box (here, inner and outer refer to the direction between the two upper locking boxes as inner and the direction of separation between the two upper locking boxes as outer), and is fixedly connected to the upper locking box; the side seat holes are located on the inner and outer seats, and are concentric holes, with the axes of the two holes parallel to the bottom of the upper locking box; the outer seat is located on the outer side of the upper locking box and connected to the upper locking box.

[0020] Furthermore, the lower crossbeam is a hollow structure.

[0021] Furthermore, the inner seat is plate-shaped.

[0022] Furthermore, the outer seat is plate-shaped.

[0023] Furthermore, a reinforcing rib is provided between the inner seat and the outer seat, and the two ends of the reinforcing rib are connected to the inner seat and the outer seat.

[0024] Furthermore, the rear door opening and closing device is installed on the housing and includes a drive unit, a middle connecting seat, a lower connecting seat, a swing arm, a rope buckle, a steel wire rope, a steering wheel, and a steering wheel seat. The drive unit is installed at the lower rear end of the housing and is hinged to the housing. The moving part of the drive unit is hinged to the swing arm via the middle connecting seat and is also connected to the power source of the drive unit. The middle connecting seat is located on the swing arm, in the middle of the swing arm, connected to the swing arm, and hinged to the moving part of the drive unit. The lower connecting seat is installed on the housing, connected to the housing, and hinged to the swing arm. The swing arm is installed on the lower connecting seat and hinged to the lower connecting seat. The rope buckle is located at the upper end of the swing arm, connected to the swing arm, and connected to one end of the steel wire rope. The steel wire rope is a flexible rope installed between the upper end of the swing arm and the lower door bolt. One end is connected to the swing arm via a rope buckle, and the other end is connected to the lower door bolt. The rope passes through a steering wheel to change direction to adapt to different installation positions of the bolt. It can automatically close the lower door under the drive of the drive device. The steering wheel is installed on a steering wheel seat and connected to the steering wheel seat via an axle, allowing it to rotate on the steering wheel seat. The steering wheel seat is installed on the door frame or box body and connected to the door frame or box body, and connected to the steering wheel via a rotating shaft.

[0025] Furthermore, the driving device is a hydraulic cylinder, a pneumatic cylinder, or an electric actuator.

[0026] Furthermore, the wire rope can be a wire rope, a fabric rope, a transmission chain, or an anchor chain.

[0027] Furthermore, the outer circumference of the steering wheel is provided with a groove.

[0028] Furthermore, there is more than one steering wheel and steering wheel axle.

[0029] Furthermore, the rear of the box body is provided with a transition plate, a rear connecting plate, side ribs, a central reinforcing rib, a side support frame, and a rear end support frame; the transition plate is located at the rear of the bottom of the box body, with its front end smoothly connected to the bottom of the box body and its rear end connected to the rear connecting plate; the rear connecting plate is located behind the transition plate, connected to the transition plate, and its other end connected to the rear end support frame; the side ribs are located on both sides of the longitudinal centerline of the transition plate and at the front end (small end) of the transition plate, connected to the transition plate, and connected to the box body beam; The central reinforcing rib is located on the longitudinal centerline of the transition plate and connects to the tail support frame and the transition plate. The side support frame is located between the box beam and the tail support frame, extending from the box beam to the outer end of the tail support frame. One end is connected to the box beam, and the other end is connected to the tail support frame. They are distributed on both sides of the central reinforcing rib. The tail support frame is located at the tail end of the box bottom, arranged laterally. It is connected to the bottom of the door frame at the top, to the upper half of the flip bracket at the back, and to the box beam at the front, as well as to the side support frame and the tail connecting plate.

[0030] Furthermore, the transition plate is a composite curved surface shape, with the front end being curved and gradually transitioning to a flat surface at the rear end, and the flat part connecting with the tail connecting plate.

[0031] Furthermore, the height of the tail connecting plate is higher than the height of the front and middle sections of the box and is flush with the top of the flipping bracket; this facilitates a smooth flow of goods out of the box without leaving any residue.

[0032] Furthermore, the side ribs are wedge-shaped.

[0033] Furthermore, the side support frame has a hollow structure.

[0034] Furthermore, the tail support frame is a Z-shaped plate-like composite structure.

[0035] Furthermore, the tail support frame and the connecting frame are provided with notches at corresponding positions to avoid the longitudinal beams of the connecting frame.

[0036] Beneficial effects

[0037] The beneficial effects of this invention are that it can meet the national standards for transport containers and at the same time realize the self-unloading function of containers. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention when it is installed on the skeleton vehicle.

[0039] Figure 2 This is a schematic diagram of the structure of the present invention in the unloading state.

[0040] Figure 3 yes Figure 1 Top view

[0041] Figure 4 Schematic diagram of the structure of this invention where the container body and connecting frame separate during unloading.

[0042] Figure 5 This is a structural diagram of the connecting frame.

[0043] Figure 6 This is a partial structural diagram of the rear door area of ​​the enclosure.

[0044] Figure 7 This is a schematic diagram of a bottom-opening door mounted on a tilting shaft.

[0045] Figure 8 This is a structural diagram of the tilting frame.

[0046] Figure 9 This is a schematic diagram of the horizontal cross-sectional structure of the tilting frame.

[0047] Figure 10 This is a structural diagram of the lower half of the tilting frame.

[0048] Figure 11 This is a schematic diagram of the two ends of the lower half of the tilting frame.

[0049] Figure 12 This is a schematic diagram of a bottom-opening door.

[0050] Figure 13 This is a schematic diagram of the rear door opening and closing device.

[0051] Figure 14 This is a schematic diagram of the upper surface structure at the rear end of the bottom of the enclosure.

[0052] Figure 15 This is a schematic diagram of the lower structure at the rear end of the box.

[0053] Figure 16 This is a schematic diagram of the curved plate.

[0054] Figure 17 This is a schematic diagram of the arc-shaped plate installed on the flipping shaft.

[0055] Figure 18 This is a magnified view of the curved plate in its installation state.

[0056] Figure 19 This is a schematic diagram of the combined structure of the flip bracket.

[0057] A. Skeleton vehicle, A1. Locking pin, 1. Box body, 2. Connecting frame, 3. Rear door opening and closing device, 4. Tilting bracket, 5. Rear door, 6. Outer reinforcing rib, 7. Inner reinforcing rib, 8. Lifting system, 9. Front door, 11. Bottom end of box body, 12. Tilting shaft, 14. Side upper bracket, 15. Side upper axle sleeve, 16. Middle upper bracket, 17. Middle upper axle sleeve, 18. Upper axle sleeve, 19. Inner axle sleeve, 21. Front crossbeam, 22. Longitudinal beam, 23. Weight reduction structure, 24. Rear crossbeam, 31. Drive unit, 32. Middle connecting seat, 33. Lower connecting seat, 34. Swing arm, 35. Rope buckle, 36. Steel wire rope, 37. Steering wheel, 51. Rear door frame, 52. Top opening door, 53. Bottom opening door, 81. Lifting 82. Lifting system mounting base, 111. Transition plate, 112. Tail connecting plate, 113. Side rib, 114. Central reinforcing rib, 115. Side support frame, 116. Tail end support frame, 117. Box bottom plate, 118. Box longitudinal beam, 241. Lock box, 242. Rear crossbeam of connecting frame, 243. Upper bracket, 244. Rotary shaft hole, 245. Side lower support, 531. Door panel, 532. Curved plate, 533. Door hinge sleeve, 5211. Lower door panel, 5212. Lower door hinge sleeve, 5213. Wire rope connecting buckle, 5214. Lower door bolt, 5215. Lower door frame, 5321. Curved plate body, 5322. Limiting groove. Detailed Implementation

[0058] To better illustrate the technical solution of the present invention, the specific embodiments of the present invention will now be further described in conjunction with the accompanying drawings;

[0059] like Figure 6In this example, the rear door includes a door frame 51, an upward-opening door 52, a downward-opening door 53, an upward-opening door hinge, and a downward-opening door pivot. A door frame structure commonly used in this industry is selected as the door frame 51. The door frame 51 is positioned at the rear end of the box body 1, with its rear surface flush with or recessed from the rear surface of the rear crossbeam of the frame vehicle A. This means that the rearmost part of the box body 1 does not extend beyond the rear end face of the frame vehicle A. In this example, an upward-opening door 52 is selected as the top-hung door. Since the upper edge is hinged to the door frame 51, during unloading... It can open automatically by its own weight without obstructing unloading; the top-opening door 52 is installed on the door frame 51 and is hinged to the upper crossbeam of the door frame 51, and can swing around this hinge; in order to facilitate the closing of the top-opening door 52 and realize automatic opening and closing, in this example, a buckle plate is provided on the lower edge of the top-opening door 52, which is interlocked with the upper edge of the bottom-opening door 53, that is, when the bottom-opening door 53 is fastened, it can press the top-opening door 52 tightly onto the door frame; in this example, the bottom-opening door 53 is selected to have an arc-shaped structure on the lower outer edge, and its arc shape is similar to the shape of the rear of the box body 1. The shape and door frame structure are matched; the lower end of the lower opening door 53 is installed on the flip shaft 12 of the flip bracket 4 and swings around the flip shaft 12 of the flip bracket 4. The upper part of the lower opening door 53 is fastened to the lower part of the door frame 51, and a locking device is used to fasten and lock the lower opening door 53 to the door frame 51. At the same time, the downward swing angle of the lower opening door 53 is set to be less than 150°. In this way, the upper edge of the lower opening door 53 forms a platform or a downwardly inclined platform that is a distance away from the rear of the skeleton vehicle A. The unloaded goods are thrown out on the upper surface of the lower opening door 53 and do not stay on the skeleton vehicle. At the rear, to avoid crowding of the rear wheels of the frame vehicle, a commonly used overhead door hinge is selected as the top-opening door hinge. The top-opening door hinge is installed between the upper crossbeam of the door frame 51 and the upper edge of the top-opening door 52, which can hinge the top-opening door 52 to the door frame 51. The bottom-opening door pivot is hollow and is fitted on the pivot shaft 12 of the tilting bracket, which can swing around the pivot shaft 12 of the tilting bracket 4. This completes the implementation of the rear door 5 of the box body 1. It has the advantages of facilitating unloading and avoiding crowding at the rear of the frame vehicle after unloading.

[0060] like Figures 1-4The container of this invention consists of two main parts: the container body and the connecting frame. A U-shaped, top-opening cargo container body 1 is selected as the container body 1. The container body 1 is mounted on the connecting frame 2 and connected to the connecting frame 2 via a flip-up bracket 4. A lightweight, integral I-beam connecting frame 2 is selected as the connecting frame 2. The connecting frame 2 is installed below the container body 1, with its rear end hinged to the container body 1 via the flip-up bracket 4. The front end of the connecting frame 2 uses a lock or hook commonly used in the industry to lock itself to the container body 1. The lower part of the connecting frame 2 is equipped with a locking bracket corresponding to the frame vehicle A, namely a locking box 241, which can engage and lock with the locking pin on the frame vehicle A. All these components conform to national container production standards and ensure the safety of the container body 1. The tail and the tail of the connecting frame 2 must not extend beyond the rear edge of the skeleton vehicle A, otherwise it will conflict with national standards. The flipping bracket 4 is set between the box body 1 and the connecting frame 2, and the tail of the box body 1 and the tail of the connecting frame 2 are connected together by a hinge. During unloading, the connecting frame 2 is connected to the skeleton vehicle A and remains stationary, while the box body 1 swings upward around the front end of the flipping bracket 4 to achieve the unloading function. In this example, the flipping bracket 4 is divided into a lower half and a rear half. That is, the part set on the box body 1 and connected to the box body 1 is the upper half of the flipping bracket, and the part set on the connecting frame 2 and connected to the connecting frame 2 is the lower half of the flipping bracket. The upper half and the lower half of the flipping bracket are connected by a flipping shaft 12. This solves the problem. This invention addresses the conflict between the self-unloading mechanism of rear-loading containers and relevant national standards for ensuring traffic safety. In this example, the rear door 5 is located at the rear of the container body 1, with a split upper and lower structure, hinged to the door frame 51 at the rear of the container body 1, allowing it to swing open backwards. Thus, the upper door 52 automatically opens under its own weight during unloading, while the lower door 53, once opened, supports the cargo flowing out from the lower door 53 and onto the ground, rather than landing directly at the rear of the container body 1. This solves the new problem of cargo congestion near the wheels after unloading, which arose after resolving the conflict with national standards for rear-loading containers. The external reinforcing rib 6 is located on the outside of the container body 1 and connected to the exterior, enhancing the container's strength. The length of the box 1 is determined by the number of external reinforcing ribs 6. In this example, a 9-meter-long box 1 is used as an example, and four external reinforcing ribs 6 are set and evenly arranged on the outside of the box 1. The internal reinforcing ribs are set in the inner cavity of the box 1 and connected to the box 1. In this example, the hydraulic lifting system commonly used in this industry is selected as the original lifting system 8. The lifting system 8 is installed in the front cavity of the box 1 and the front support of the connecting frame 2. The part located at the front of the inner cavity of the box 1 is isolated from the inner cavity of the box 1 by a partition to avoid interference between the goods and the lifting system 8. The front door 9 is set at the front of the box 1 to close the front of the inner cavity of the box 1. In this example, the bottom of the box 1 is arc-shaped and smoothly connected to the two side walls of the box 1.The connection point between the bottom end and the tilting bracket 4 is a flat surface, and this surface is higher than the bottom of the box body 1. This allows loose goods to flow smoothly from the side walls to the bottom, and prevents the bottom of the box body 1 from accumulating goods at the tail or causing unloading difficulties because it is lower than the tilting bracket 4.

[0061] In application, the invention is placed on and locked to the skeleton vehicle A. This locking method is common in international freight transport, making it convenient and quick. It can be operated using existing standard lifting and automated equipment and tools. After loading the goods, the vehicle is transported by road. Upon arrival at the destination, the driver opens the latches at the front of the container 1 and connecting frame 2 (automatic latches can also be used, operated by remote control). The rear door is opened using the remote control (built into the lifting system 8), and the lifting elements of the lifting system 8 are activated. The lifting elements lift the front of the container 1, and the goods are unloaded from the rear door. After unloading, the operation is reversed, lowering the lifting elements and locking the latches at the front of the container 1 and connecting frame 2, thus locking the rear door. This completes a full freight transport process, achieving compliance with regulations, speed, convenience, and a high degree of automation.

Claims

1. A rear door structure of a rear self-discharging freight container, characterized by: The rear door includes a door frame, an upward-opening door, a downward-opening door, an upward-opening door hinge, and a downward-opening door pivot. The door frame is located at the rear end of the body, with its rear surface flush with or recessed from the rear surface of the rear crossbeam of the frame vehicle. The upward-opening door is mounted on the door frame and hinged to the upper crossbeam of the door frame, allowing it to swing around the hinge. The lower edge of the upward-opening door has a latch plate that engages with the upper edge of the downward-opening door, pressing the upward-opening door firmly against the door frame when the downward-opening door is engaged. The lower end of the downward-opening door is mounted on a tilting bracket and swings around the tilting axis of the bracket, while its upper part is connected to the door frame. The lower part of the frame is fastened, and a locking device secures the bottom door to the frame. The downward swing angle of the bottom door is less than 150°, so that the upper edge of the bottom door forms a platform or downward unloading platform at a distance from the rear of the skeleton vehicle, and the unloaded goods are thrown out instead of staying at the rear of the skeleton vehicle and causing congestion to the rear wheels. The upper door hinge is installed between the upper beam of the door frame and the upper edge of the upper door, which can hinge the upper door to the door frame. The bottom door flipping shaft is hollow and arc-shaped, and is fitted on the flipping shaft of the flipping bracket, which can swing around the flipping shaft of the flipping bracket.

2. A rear door structure for a rear self-discharging freight container according to claim 1, characterized in that: The shape inside the door frame matches the shape at the rear of the box.

3. The rear door structure of a rear self-discharging freight container according to claim 1, characterized in that: The aforementioned top-opening door includes an upper door frame and an upper door panel.

4. The rear door structure of a rear-loading self-unloading freight container according to claim 1, characterized in that: The bottom-opening door includes a bottom door frame and a bottom door panel, and the shape of the bottom-opening door composed of the bottom door frame and the bottom door panel matches the cross-sectional shape of the rear of the box.

5. The rear door structure of a rear self-discharging freight container according to claim 1, characterized in that: The bottom-opening door is equipped with a bolt, which can press the bottom-opening door and the top-opening door firmly against the door frame.

Images