Back door self-opening and self-closing mechanism for container

Abstract

The utility model discloses a back door self-opening and self-closing mechanism for a container, and belongs to the technical field of container semitrailers. The mechanism is mainly composed of a jacking assembly, a deflector rod assembly, a gear rod assembly, a limiting assembly and a controller. The jacking assembly drives the shifting rod shifting fork to move up and down along the shifting fork guide groove base through a jacking oil cylinder, and the door opening shifting rod is driven to ascend and descend. The deflector rod component drives a deflector rod transmission shaft and a door opening deflector rod to rotate by utilizing a deflector rod swinging oil cylinder through gear and rack transmission; the stop lever assembly is arranged on the rear door and driven by the door opening deflector rod to open and close the rear door. The limiting assembly controls the action range of the oil cylinder through a plurality of limiting sensors and induction blocks; and the controller coordinates all the components to work. According to the working principle, the controller controls the oil cylinder to act, and the rear door is automatically opened and closed in combination with precise control of the limiting assembly. According to the mechanism, the operation efficiency is effectively improved, the labor intensity is reduced, the operation accuracy is improved, the modern logistics development requirement is met, and remarkable economic and social benefits are achieved.

Description

Technical Field

[0001] This application relates to the field of container semi-trailer technology, and in particular to a rear door self-opening and closing mechanism for containers. Background Technology

[0002] In the container shipping industry, the opening and closing of container rear doors has always been a key factor affecting cargo loading and unloading efficiency and labor costs. Traditional methods of opening and closing container rear doors mainly rely on manual operation, which has many obvious drawbacks.

[0003] From a labor cost perspective, in logistics scenarios with frequent loading and unloading of goods, workers need to repeatedly open and close the rear doors of containers. For example, in large logistics warehouses, there may be dozens or even hundreds of loading and unloading operations every day, each of which requires manual handling of the rear door opening and closing. This makes the labor intensity of workers extremely high, and long-term operation can easily lead to physical fatigue, which not only reduces work efficiency but may also cause safety hazards.

[0004] In terms of operational efficiency, manual operation is relatively slow, especially in emergency transport or situations with high cargo turnover, and cannot meet the demand for rapid loading and unloading. Furthermore, the precision of manual operation is limited, making it difficult to ensure that each opening and closing action is completely consistent, which may affect the container's sealing performance and pose a potential threat to cargo protection.

[0005] With the rapid development of the logistics industry, the scale and frequency of cargo transportation are constantly increasing, placing higher demands on the efficiency, convenience, and intelligence of container operations. Traditional manual opening and closing methods have gradually become a bottleneck for improving logistics efficiency and cannot adapt to the development trend of modern logistics characterized by rapid turnover and efficient operation. Utility Model Content

[0006] This utility model addresses the aforementioned problems in the existing technology by providing a self-opening and closing mechanism for the rear door of a container.

[0007] The objective of this utility model is mainly achieved through the following solution:

[0008] A self-opening and closing mechanism for a container rear door, comprising:

[0009] The lifting assembly includes a shift fork guide slot seat, a shift lever shift fork, a second pin, a lifting cylinder, and a lifting cylinder fixing seat. The lifting cylinder can drive the shift lever shift fork to move up and down along the shift fork guide slot seat.

[0010] The lever assembly includes a door opening lever, a lever drive shaft fixing seat, a lever drive shaft, a lever mounting base plate, a lever intermediate drive shaft, a lever intermediate drive shaft fixing seat, a lever drive rack, a first pin, a lever swing cylinder, and a lever swing cylinder mounting seat. The door opening lever is inserted into the lever drive shaft. The lever swing cylinder drives the lever intermediate drive shaft and the lever drive shaft to rotate through gear and rack transmission, thereby causing the door opening lever to swing. The lever displacement fork is connected to the door opening lever and can drive the door opening lever to move up and down.

[0011] The stop lever assembly, installed on the rear door of the container, includes a stop lever rolling bearing, a stop lever, a stop lever limiting seat, and a guide sleeve. The stop lever rolling bearing is installed on the top of the stop lever. The stop lever is limited in its vertical position by the stop lever limiting seat. The stop lever rolling bearing is controlled to enter and disengage from the track groove at the bottom of the door lever. The door opening lever drives the stop lever assembly to open and close the rear door of the container.

[0012] The limit assembly includes multiple limit sensors and limit sensing blocks, used to control the range of motion of the lifting cylinder and the lever swing cylinder;

[0013] The controller is used to coordinate the actions of the various components.

[0014] Preferably, the two side walls of the shift fork guide groove seat are symmetrically provided with first limiting slide grooves, the shift lever shift fork is slidably connected to the shift fork guide groove seat through the first limiting slide grooves, the fixed end of the lifting cylinder is movably connected to the lifting cylinder fixed seat, and the telescopic end of the lifting cylinder is movably connected to the bottom of the shift lever shift fork through the second pin.

[0015] Preferably, a bushing with upper and lower openings is provided on one side of the lever shifting fork, and the door opening lever is inserted into the bushing through a groove in the side wall, and the door opening lever and the lever shifting fork are rotatably connected by the bushing.

[0016] Preferably, the lever mounting base is installed on the side wall of the container. The lever drive shaft fixing seat, the lever intermediate drive shaft fixing seat, the lever swing cylinder mounting seat, the lever fork guide groove seat, and the lifting cylinder fixing seat are all installed on the side wall of the lever mounting base. The lever drive shaft is rotatably connected to the lever drive shaft fixing seat, and the lever intermediate drive shaft is rotatably connected to the lever intermediate drive shaft fixing seat. The fixed end of the lever swing cylinder is movably connected to the lever swing cylinder mounting seat. The telescopic end of the lever swing cylinder is movably connected to the bottom of the lever drive rack through a first pin. The side wall of the lever mounting base is vertically provided with a second limiting groove for the lever drive rack to move up and down.

[0017] Preferably, a transmission gear is fixedly fitted at one end of the intermediate drive shaft of the lever near the lever drive rack. The transmission gear meshes with the lever drive rack. A first bevel gear is provided at one end of the intermediate drive shaft near the lever drive shaft, and a second bevel gear is provided at the bottom end of the lever drive shaft. The first bevel gear meshes with the second bevel gear. The lever swing cylinder drives the intermediate drive shaft of the lever to rotate through the lever drive rack and the transmission gear. The intermediate drive shaft of the lever drives the lever drive shaft to rotate through the first bevel gear and the second bevel gear.

[0018] Preferably, the upper end of the lever drive shaft adopts an external hexagonal shaft structure, and the lower end of the door opening lever adopts an internal hexagonal sleeve structure. The upper end of the lever drive shaft and the lower end of the door opening lever are connected by a plug-in joint, and the lever drive shaft and the door opening lever remain in a plug-in state during the process of the lever shifting fork driving the door opening lever to rise and fall.

[0019] Preferably, the guide sleeve is installed on the side wall of the rear door, and the stop bar is slidably connected inside the guide sleeve. The side wall of the stop bar limiting seat is provided with an upper slot and a lower slot, and the side wall of the stop bar is provided with a locking strip that cooperates with the stop bar limiting seat.

[0020] Preferably, the door opening lever has an inverted L-shaped structure, with its bottom connected to the lever drive shaft, forming a vertically arranged first lever part, and its top forming a horizontally arranged second lever part. The lower surface of the second lever part has a track groove along its length, and the lever rolling bearing can slide along the inside of the track groove.

[0021] Preferably, the limiting assembly includes a third limiting sensor, a second limiting sensor, a first limiting sensor, a first limiting sensor mounting base, a first limiting sensing block, a fourth limiting sensor, a second limiting sensor mounting base, and a second limiting sensing block. The second limiting sensing block is fixed on the lever shift fork and moves up and down with the lever shift fork. It transmits signals through the fourth limiting sensor to control the extension and retraction of the lifting cylinder, thereby driving the opening lever to rise and fall to complete the connection between the opening lever and the stop lever. The fourth limiting sensor is mounted on the second limiting sensor mounting base. The first limiting sensing block is fixed on the lever transmission rack and moves up and down with the lever transmission rack. It transmits signals through the third, second, and first limiting sensors to control the extension and retraction of the swing cylinder, thereby controlling the opening and closing of the rear door by controlling the swing angle of the opening lever. The third, second, and first limiting sensors are mounted sequentially on the first limiting sensor mounting base from top to bottom.

[0022] Preferably, the controller is installed on the side wall of the container.

[0023] In summary, compared with the prior art, the present invention has the following beneficial technical effects:

[0024] (1) This utility model improves the operating efficiency and realizes the automated operation of the container rear door, greatly shortening the time required for the rear door to open and close. Compared with manual operation, there is no need to wait for workers to manually open and close the rear door during the loading and unloading process, which can significantly improve the overall efficiency of loading and unloading and speed up the turnover of logistics transportation.

[0025] (2) This utility model reduces labor intensity, and operators no longer need to perform heavy manual opening and closing of the back door, which reduces physical exertion and fatigue, reduces safety risks caused by fatigue work, and improves the work comfort and work enthusiasm of workers.

[0026] (3) This utility model improves the accuracy of operation. Through the design of the limit component and the transmission structure, it can accurately control the lifting and swing angle of the door opening lever, ensuring the consistency and accuracy of each opening and closing action of the rear door, effectively improving the sealing performance of the container and better protecting the safety of the goods.

[0027] (4) This utility model is adapted to the needs of modern logistics development, meets the requirements of modern logistics industry for efficient and intelligent transportation equipment, can be seamlessly connected with automated logistics system, helps to improve the overall quality and efficiency of logistics transportation, and enhances the market competitiveness of logistics enterprises. Attached Figure Description

[0028] Figure 1 This is the front view of this utility model;

[0029] Figure 2 This is a schematic diagram of the initial position of the door opening lever in this utility model;

[0030] Figure 3 This is a schematic diagram of the door opening process of the door opening lever in this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the intermediate transmission shaft of the lever in this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the middle stop bar limiting seat of this utility model;

[0033] Figure 6 This is a schematic diagram showing the connection between the intermediate gear lever rolling bearing and the door opening lever of this utility model.

[0034] Reference numerals: 1-Door opening lever; 2-Lever drive shaft fixing seat; 3-Lever drive shaft; 4-Lever mounting base plate; 5-Lever intermediate drive shaft; 6-Lever intermediate drive shaft fixing seat; 7-Lever drive rack; 8-First pin; 9-Lever swing cylinder; 10-Lever swing cylinder mounting seat; 11-Fork guide slot seat; 12-Lever shifting fork; 13-Second pin; 14-Lifting cylinder; 15-Lifting cylinder fixing seat; 16-Third limit sensor; 17-Second limit sensor; 18-First limit sensor; 19-First limit sensor mounting seat; 20-First limit sensing block; 21-Fourth limit sensor; 22-Second limit sensor mounting seat; 23-Second limit sensing block; 24-Gate lever rolling bearing; 25-Gate lever; 26-Gate lever limit seat; 27-Guide sleeve; 28-Control box. Detailed Implementation

[0035] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0036] Example 1:

[0037] like Figure 1 , 2 As shown in Figure 3, this utility model discloses a technical solution: a self-opening and closing mechanism for the rear door of a container, comprising: a lifting assembly, a lever assembly, a stop lever assembly, a limit assembly, and a controller 28.

[0038] The lifting assembly includes a fork guide groove seat 11, a lever shifting fork 12, a second pin 13, a lifting cylinder 14, and a lifting cylinder fixing seat 15. The lifting cylinder 14 can drive the lever shifting fork 12 to move up and down along the fork guide groove seat 11. Specifically, the fork guide groove seat 11 adopts a U-shaped structure, and the notch is located on the front side. The left and right side walls of the notch on the front side of the fork guide groove seat 11 are symmetrically provided with first limiting slide grooves to provide a stable up and down sliding track for the lever shifting fork 12. The lever shifting fork 12 is slidably connected to the fork guide groove seat 11 through the first limiting slide groove.

[0039] The lever assembly includes a door opening lever 1, a lever drive shaft fixing seat 2, a lever drive shaft 3, a lever mounting base plate 4, a lever intermediate drive shaft 5, a lever intermediate drive shaft fixing seat 6, a lever drive rack 7, a first pin 8, a lever swing cylinder 9, and a lever swing cylinder mounting seat 10. The lever mounting base plate 4 is bolted to the side wall of the container near the rear door, and the rear door is rotatably connected to the container. The lever drive shaft fixing seat 2, the lever intermediate drive shaft fixing seat 6, the lever swing cylinder mounting seat 10, the lever fork guide slot seat 11, and the lifting cylinder fixing seat 15 are all bolted to the door opening lever 1. The lever is fixedly installed on the front side wall of the lever mounting base plate 4, and the lever drive shaft 3 is vertically set. The lever drive shaft 3 is rotatably connected to the lever drive shaft fixing seat 2. The lever intermediate drive shaft 5 is horizontally set and rotatably connected to the lever intermediate drive shaft fixing seat 6. The door opening lever 1 is inserted into the lever drive shaft 3. The lever swing cylinder 9 drives the lever intermediate drive shaft 5 and the lever drive shaft 3 to rotate through the gear and rack transmission structure, thereby driving the door opening lever 1 to swing. The lever shifting fork 12 is connected to the door opening lever 1 and can drive the door opening lever 1 to move up and down.

[0040] The stop lever assembly is installed on the rear door of the container and includes a stop lever rolling bearing 24, a stop lever 25, a stop lever limiting seat 26, and a guide sleeve 27. The stop lever 25 is vertically arranged, and the inner ring of the stop lever rolling bearing 24 is fitted on the top of the stop lever 25. The stop lever 25 is slidably connected to the guide sleeve 27 installed on the upper side wall of the rear door to ensure its smooth movement. The stop lever 25 is limited in its vertical position by the stop lever limiting seat 26, which controls the stop lever rolling bearing 24 to enter and disengage from the track groove at the bottom of the door lever 1. The door opening lever 1 drives the stop lever assembly to open and close the rear door of the container.

[0041] The limit assembly includes multiple limit sensors and limit sensing blocks, which are used to control the range of motion of the lifting cylinder 14 and the lever swing cylinder 9 to achieve precise opening and closing control of the rear door.

[0042] The controller 28 is installed on the side wall of the container and serves as the control core of the entire self-opening and closing mechanism. It coordinates the actions of the lifting assembly, lever assembly, stop assembly and limit assembly to ensure that each component works together in accordance with a predetermined program to realize the automatic opening and closing of the container rear door. In this application, the controller 28 adopts a PLC controller.

[0043] Example 2:

[0044] like Figure 1As shown, this utility model discloses another technical solution, a self-opening and closing mechanism for the rear door of a container. The difference from embodiment 1 is that the lifting cylinder 14 is vertically arranged, and the fixed end of the lifting cylinder 14 is rotatably connected to the lifting cylinder fixed seat 15 by a pin. The telescopic end of the lifting cylinder 14 is rotatably connected to the bottom of the lever shifting fork 12 by a second pin 13. The lifting cylinder 14 can drive the lever shifting fork 12 to move up and down along the fork guide groove seat 11, providing power support for the lifting and lowering of the door opening lever 1.

[0045] Specifically, a bushing with upper and lower openings is welded to one side of the lever shifting fork 12. The door opening lever 1 is inserted into the bushing through the groove of the side wall, and the door opening lever 1 and the lever shifting fork 12 are rotatably connected through the bushing and the groove. On the one hand, the lever shifting fork 12 can drive the door opening lever 1 to move up and down, and on the other hand, the bushing does not affect the swing of the door opening lever 1.

[0046] Example 3:

[0047] like Figure 1 As shown, this utility model discloses another technical solution, a self-opening and closing mechanism for the rear door of a container. The difference from embodiment 1 is that the lever swing cylinder 9 is arranged vertically, the fixed end of the lever swing cylinder 9 is rotatably connected to the lever swing cylinder mounting base 10 by a pin, the telescopic end of the lever swing cylinder 9 is rotatably connected to the bottom of the lever transmission rack 7 by a first pin 8, and the side wall of the lever mounting base plate 4 is vertically provided with a second limiting groove for the lever transmission rack 7 to move up and down.

[0048] Specifically, such as Figure 4 As shown, a transmission gear is fixedly sleeved at one end of the intermediate drive shaft 5 of the lever near the drive rack 7 of the lever. The transmission gear is a spur gear and meshes with the drive rack 7 of the lever. A first bevel gear is fixedly sleeved at one end of the intermediate drive shaft 5 of the lever near the drive shaft 3 of the lever. A second bevel gear is fixedly sleeved at the bottom end of the drive shaft 3 of the lever. The first bevel gear and the second bevel gear mesh with each other. The lever swing cylinder 9 drives the intermediate drive shaft 5 of the lever to rotate through the drive rack 7 of the lever and the transmission gear. The intermediate drive shaft 5 of the lever drives the drive shaft 3 of the lever to rotate through the first bevel gear and the second bevel gear, thereby driving the door opening lever 1 to swing.

[0049] Specifically, the upper end of the lever drive shaft 3 adopts an external hexagonal shaft structure, and the lower end of the door opening lever 1 adopts an internal hexagonal sleeve structure. The upper end of the lever drive shaft 3 and the lower end of the door opening lever 1 are connected by a plug-in joint. During the process of the lever shift fork 12 driving the door opening lever 1 to rise and fall, the lever drive shaft 3 and the door opening lever 1 remain in a plug-in state to ensure effective power transmission and maintain connection during the rising and falling process.

[0050] Example 4:

[0051] like Figure 2 , 5 As shown, this utility model discloses another technical solution, a self-opening and closing mechanism for the rear door of a container. The difference from embodiment 1 is that the side wall of the stop bar limiting seat 26 is provided with an upper slot and a lower slot, and the side wall of the stop bar 25 is welded with a locking strip that works in conjunction with the stop bar limiting seat 26 to precisely limit the up and down position of the stop bar 25, thereby controlling the stop bar rolling bearing 24 at the top of the stop bar to enter and disengage from the track groove at the bottom of the door lever 1.

[0052] Specifically, the door opening lever 1 has an inverted L-shaped structure. Its bottom is connected to the lever drive shaft 3, forming the first lever section, which is vertically arranged, and its top is the second lever section, which is horizontally arranged. Figure 6 As shown, a track groove is provided on the lower surface of the second lever part along its length direction, and the lever rolling bearing 24 can slide along the inside of the track groove.

[0053] Example 5:

[0054] like Figure 1 As shown, this utility model discloses another technical solution: a self-opening and closing mechanism for the rear door of a container. The difference from Embodiment 1 is that the limiting assembly includes a third limiting sensor 16, a second limiting sensor 17, a first limiting sensor 18, a first limiting sensor mounting base 19, a first limiting sensing block 20, a fourth limiting sensor 21, a second limiting sensor mounting base 22, and a second limiting sensing block 23. The second limiting sensing block 23 is fixed to the lever shifting fork 12 and moves up and down with the lever shifting fork 12. It also transmits signals through the fourth limiting sensor 21 to control the extension and retraction of the lifting cylinder 14, thereby driving the opening... The door lever 1 is raised and lowered to connect the door opening lever 1 with the stop lever 25. The fourth limit sensor 21 is installed on the second limit sensor mounting base 22. The first limit sensing block 20 is fixed on the lever transmission rack 7 and moves up and down with the lever transmission rack 7. It transmits signals through the third limit sensor 16, the second limit sensor 17 and the first limit sensor 18 to control the extension and retraction of the swing cylinder, and then controls the opening and closing of the rear door by controlling the swing angle of the door opening lever 1. The third limit sensor 16, the second limit sensor 17 and the first limit sensor 18 are installed on the first limit sensor mounting base 19 from top to bottom.

[0055] In this application, the mains power or storage battery power is used. The cylinder, limit assembly and other electrical components are all electrically connected to the controller 28 and controlled by the controller. It should be noted that the specific principles, structure, circuit connection and signal transmission path of the controller and electrical components are not within the protection scope of this application, and can be deduced by those skilled in the art through conventional technical means, and will not be elaborated here.

[0056] The present invention provides a self-opening and closing mechanism for the rear door of a container, the working principle of which is as follows:

[0057] Door opening action: The operator activates the relevant button on the controller 28, and the lifting cylinder 14 begins to work. Its telescopic end pushes the lever shift fork 12 upward along the first limit slide groove of the fork guide seat 11. The lever shift fork 12 drives the door opening lever 1 to rise synchronously through the bushing. When the fourth limit sensor 21 senses the second limit sensing block 23, it sends a signal to the controller 28. The controller 28 controls the lifting cylinder 14 to stop. At this time, the lever swing cylinder 9 starts, and its telescopic end pushes the lever transmission rack 7 upward along the second limit slide groove of the lever mounting base plate 4. The lever transmission rack 7 meshes with the transmission gear of the lever intermediate transmission shaft 5, driving the lever intermediate transmission shaft 5 to rotate. Then, through the meshing of the first and second bevel gears, the lever drive shaft 3 rotates, driving the door opening lever 1 to rotate. When the second limit sensor 17 senses the first limit sensing block 20, the lever swing cylinder 9 stops extending, and the door opening lever 1 stops swinging. The operator manually moves the stop lever 25 upward, so that the locking strip on the stop lever 25 is engaged in the upper locking groove, and the stop lever rolling bearing 24 is inserted into the track groove at the bottom of the door opening lever 1. Then, the lever swing cylinder 9 is activated again, and it continues to extend, driving the door opening lever 1 to swing outward. When the third limit sensor 16 senses the first limit sensing block 20, the lever swing cylinder 9 stops operating, and the rear door opens to the preset position, completing the door opening action.

[0058] Closing Action: When the closing command is initiated on the controller 28, the lever swing cylinder 9 retracts, driving the lever transmission rack 7 to move downward along the second limit slide groove, causing the door opening lever 1 to swing inward. When the second limit sensor 17 senses the first limit sensing block 20, the lever swing cylinder 9 stops retracting. The operator manually moves the stop lever 25 downward, causing the locking strip on the stop lever 25 to engage with the lower locking groove below, and at the same time causing the stop lever rolling bearing 24 to disengage from the track groove at the bottom of the door lever 1. The lever swing cylinder 9 is then retracted again. When the first limit sensor 18 senses the first limit sensing block 20, the lever swing cylinder 9 stops working, and the lifting cylinder 14 begins to retract until it is fully retracted, the rear door closes, and the closing action is completed.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-opening and closing mechanism for the rear door of a container, characterized in that, This organization includes: The lifting assembly includes a fork guide groove seat (11), a lever shifting fork (12), a second pin (13), a lifting cylinder (14), and a lifting cylinder fixing seat (15). The lifting cylinder (14) can drive the lever shifting fork (12) to move up and down along the fork guide groove seat (11). The lever assembly includes a door opening lever (1), a lever drive shaft fixing seat (2), a lever drive shaft (3), a lever mounting base plate (4), a lever intermediate drive shaft (5), a lever intermediate drive shaft fixing seat (6), a lever drive rack (7), a first pin shaft (8), a lever swing cylinder (9), and a lever swing cylinder mounting seat (10). The door opening lever (1) is inserted into the lever drive shaft (3). The lever swing cylinder (9) drives the lever intermediate drive shaft (5) and the lever drive shaft (3) to rotate through the gear and rack transmission, thereby driving the door opening lever (1) to swing. The lever shifting fork (12) is connected to the door opening lever (1) and can drive the door opening lever (1) to move up and down. The stop lever assembly, which is installed on the rear door of the container, includes a stop lever rolling bearing (24), a stop lever (25), a stop lever limiting seat (26), and a guide sleeve (27). The stop lever rolling bearing (24) is installed on the top of the stop lever (25). The stop lever (25) is limited in its up and down position by the stop lever limiting seat (26). The stop lever rolling bearing (24) is controlled to enter and disengage from the track groove at the bottom of the door lever (1). The door opening lever (1) drives the stop lever assembly to open and close the rear door of the container. The limit assembly includes multiple limit sensors and limit sensing blocks, used to control the range of motion of the lifting cylinder (14) and the lever swing cylinder (9); The controller (28) is used to coordinate the actions of the components.

2. The self-opening and closing mechanism for a container rear door according to claim 1, characterized in that, The two side walls of the shift fork guide groove seat (11) are symmetrically provided with first limiting slide grooves. The shift lever shift fork (12) is slidably connected to the shift fork guide groove seat (11) through the first limiting slide groove. The fixed end of the lifting cylinder (14) is movably connected to the lifting cylinder fixed seat (15). The telescopic end of the lifting cylinder (14) is movably connected to the bottom of the shift lever shift fork (12) through the second pin (13).

3. The self-opening and closing mechanism for a container rear door according to claim 2, characterized in that, The lever shift fork (12) is provided with a bushing with upper and lower openings on one side. The door opening lever (1) is inserted into the bushing through the groove of the side wall, and the door opening lever (1) and the lever shift fork (12) are rotatably connected through the bushing.

4. The self-opening and closing mechanism for a container rear door according to claim 1, characterized in that, The lever mounting base plate (4) is installed on the side wall of the container. The lever drive shaft fixing seat (2), the lever intermediate drive shaft fixing seat (6), the lever swing cylinder mounting seat (10), the lever guide groove seat (11), and the lifting cylinder fixing seat (15) are all installed on the side wall of the lever mounting base plate (4). The lever drive shaft (3) is rotatably connected to the lever drive shaft fixing seat (2), and the lever intermediate drive shaft (5) is rotatably connected to the lever intermediate drive shaft fixing seat (6). The fixed end of the lever swing cylinder (9) is movably connected to the lever swing cylinder mounting seat (10). The telescopic end of the lever swing cylinder (9) is movably connected to the bottom of the lever drive rack (7) through the first pin (8). The side wall of the lever mounting base plate (4) is vertically provided with a second limiting groove for the lever drive rack (7) to move up and down.

5. A rear door self-opening and closing mechanism for a container according to claim 4, characterized in that, A transmission gear is fixedly fitted at one end of the intermediate drive shaft (5) of the lever near the drive rack (7). The transmission gear meshes with the drive rack (7). A first bevel gear is provided at one end of the intermediate drive shaft (5) near the drive shaft (3). A second bevel gear is provided at the bottom end of the drive shaft (3). The first bevel gear meshes with the second bevel gear. The lever swing cylinder (9) drives the intermediate drive shaft (5) to rotate through the drive rack (7) and the transmission gear. The intermediate drive shaft (5) drives the drive shaft (3) to rotate through the first bevel gear and the second bevel gear.

6. A rear door self-opening and closing mechanism for a container according to claim 5, characterized in that, The upper end of the lever drive shaft (3) adopts an external hexagonal shaft structure, and the lower end of the door opening lever (1) adopts an internal hexagonal sleeve structure. The upper end of the lever drive shaft (3) and the lower end of the door opening lever (1) are connected by a plug-in connection. During the process of the lever shift fork (12) driving the door opening lever (1) to rise and fall, the lever drive shaft (3) and the door opening lever (1) remain in a plug-in connection state.

7. The self-opening and closing mechanism for a container rear door according to claim 1, characterized in that, The guide sleeve (27) is installed on the side wall of the rear door, and the stop bar (25) is slidably connected in the guide sleeve (27). The side wall of the stop bar limiting seat (26) is provided with an upper slot and a lower slot, and the side wall of the stop bar (25) is provided with a locking strip that works in conjunction with the stop bar limiting seat (26).

8. A rear door self-opening and closing mechanism for a container according to claim 7, characterized in that, The door opening lever (1) has an inverted L-shaped structure. Its bottom is connected to the lever drive shaft (3), which is a vertically arranged first lever part and a horizontally arranged second lever part. The lower surface of the second lever part has a track groove along its length direction, and the stop lever rolling bearing (24) can slide along the inside of the track groove.

9. A rear door self-opening and closing mechanism for a container according to claim 1, characterized in that, The limiting assembly includes a third limiting sensor (16), a second limiting sensor (17), a first limiting sensor (18), a first limiting sensor mounting base (19), a first limiting sensing block (20), a fourth limiting sensor (21), a second limiting sensor mounting base (22), and a second limiting sensing block (23). The second limiting sensing block (23) is fixed on the lever shift fork (12) and moves up and down with the lever shift fork (12). It also transmits signals through the fourth limiting sensor (21) to control the extension and retraction of the lifting cylinder (14), thereby driving the door opening lever (1) to rise and fall to complete the door opening lever (1) and the stop lever (25). The fourth limit sensor (21) is installed on the second limit sensor mounting base (22); the first limit sensing block (20) is fixed on the lever transmission rack (7) and moves up and down with the lever transmission rack (7). It transmits signals through the third limit sensor (16), the second limit sensor (17) and the first limit sensor (18) to control the extension and retraction of the swing cylinder, and then controls the opening and closing of the rear door by controlling the swing angle of the door opening lever (1). The third limit sensor (16), the second limit sensor (17) and the first limit sensor (18) are installed on the first limit sensor mounting base (19) from top to bottom.

10. A rear door self-opening and closing mechanism for a container according to claim 1, characterized in that, The controller (28) is installed on the side wall of the container.

Images