A step boarding dock door

Abstract

The application provides a stepped boarding door, which comprises a door, two driving assemblies, a first ladder structure, a second ladder structure, two support structures and two limiting mechanisms. The door is provided with a mounting groove. The two driving assemblies are mounted on the door and a vehicle body and are used for driving the door to overturn. The first ladder structure is mounted on the door. The second ladder structure is mounted on one end of the first ladder structure away from the door. The two support structures are hinged to the door and are used for supporting the door. The two limiting mechanisms are mounted on the door and can limit the two support structures in the mounting groove and are arranged in one-to-one correspondence with the two support structures. The stepped boarding door provided by the application can be more stable during use, thereby improving the stability of the door during use.

Description

Technical Field

[0001] This application relates to the field of boarding doors, and in particular to a stepped boarding door. Background Technology

[0002] With the accelerating pace of urbanization, the continuous expansion of urban areas, and the increasing concentration of population, urban drainage systems face an unprecedented burden, especially given the frequent occurrence of extreme weather events. As core equipment for emergency response, the operational efficiency of drainage and flood control vehicles directly impacts the speed of urban flood control and drainage response and the ability to safeguard people's livelihoods. The ability of operators to board the vehicle smoothly and quickly is one of the key factors affecting the operational efficiency of these vehicles.

[0003] Currently, during drainage and emergency rescue operations, the loading hatch is prone to damage and has low stability, resulting in low drainage efficiency and increasing the risk of injury to operators. Utility Model Content

[0004] The purpose of this application is to provide a stepped boarding gate to solve the technical problem of unstable use of boarding gates in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a stepped boarding door, comprising: The storage door is provided with an installation groove; Two drive components; the two drive components are mounted on the cargo door and the vehicle body and are used to drive the cargo door to tilt. A first-tier structure is installed on the warehouse door; The second step structure is installed at the end of the first step structure away from the door; Two support structures are hinged to the compartment door and used to support the compartment door; Two limiting mechanisms are installed on the compartment door and can limit the two bracket structures within the mounting groove, and are configured in a one-to-one correspondence with the two bracket structures.

[0006] Furthermore, the limiting mechanism includes multiple limiting components, which are installed on the compartment door and can limit the bracket structure within the mounting groove.

[0007] Furthermore, the limiting mechanism also includes at least one pin, which passes through the compartment door and is capable of limiting the bracket structure within the mounting groove.

[0008] Furthermore, the bracket structure includes a first driver and a plurality of limiting slots, wherein the plurality of limiting slots are all formed in the first driver and are configured to correspond one-to-one with the plurality of limiting components; The limiting component includes an elastic element and a locking ball. The elastic element is installed on the compartment door, and the locking ball is installed at the end of the elastic element away from the compartment door and can be engaged in the limiting groove.

[0009] Furthermore, the support structure includes a rotary motor, a first driver, and a support plate. The rotary motor is mounted on the compartment door, the first driver is mounted on the rotary motor and rotates under the drive of the rotary motor, and the support plate is mounted on the output end of the first driver.

[0010] Furthermore, the first stepped structure includes a first connecting plate, a plurality of first sliding sleeves, a plurality of first sleeve holes, a first sliding plate, a plurality of first sliding rods, a plurality of first rod holes, and a first top plate. The first connecting plate and the plurality of first sliding sleeves are all installed on the door. Each first sliding sleeve has a plurality of first sleeve holes. The first sliding plate is slidably installed in the first connecting plate. The plurality of first sliding rods are slidably installed on the plurality of first sliding sleeves and are arranged in a one-to-one correspondence with the plurality of first sliding sleeves. Each first sliding rod has a first rod hole. The first top plate is installed at the end of the first sliding plate away from the door and at the end of the plurality of first sliding rods away from the door. The first rod hole is configured to be aligned with any of the first sleeve holes, and the first slide rod is configured to be confined to the first slide sleeve by means of a pin, the first sleeve hole and the first rod hole.

[0011] Furthermore, the second stepped structure includes a second connecting plate, a plurality of second sliding sleeves, a plurality of second sleeve holes, a second sliding plate, a plurality of second sliding rods, a plurality of second rod holes, and a second top plate. The second connecting plate and the plurality of second sliding sleeves are all installed on the first top plate at the end away from the compartment door. Each second sliding sleeve has a plurality of second sleeve holes. The second sliding plate is slidably installed in the second connecting plate. The plurality of second sliding rods are slidably installed in the plurality of second sliding sleeves and correspond one-to-one with the plurality of first sliding sleeves. Each second sliding rod has a second rod hole. The second top plate is installed on the end of the second sliding plate away from the compartment door and the end of the plurality of second sliding rods away from the compartment door. The second rod hole is configured to be aligned with any of the second sleeve holes, and the second slide rod is configured to be confined to the second slide sleeve by means of a pin, the second sleeve hole, and the second rod hole.

[0012] Furthermore, the stepped loading hatch also includes a drainage channel; The drainage channel includes a plurality of first plate grooves, a first guide groove, and an internal drainage hole. The plurality of first plate grooves are all opened in the compartment door. The first guide groove is opened in the compartment door and is located inside the first connecting plate and communicates with the plurality of first plate grooves. The internal drainage hole is opened in the compartment door and communicates with the first guide groove, and is also configured to guide water in the first guide groove to the side of the compartment door facing away from the drive assembly.

[0013] Furthermore, the drainage channel also includes a plurality of second plate grooves, a second guide groove, a second connecting channel and a first connecting channel. The plurality of second plate grooves are all opened on the first top plate, the second guide groove is opened on the first top plate and communicates with the plurality of second plate grooves, the second connecting channel is opened on the second connecting plate, and the first connecting channel is opened on the first sliding plate and is used to connect the second connecting channel and the internal drainage hole.

[0014] Furthermore, the drive assembly includes a first fixed bracket, a second fixed bracket, and a second driver. The first fixed bracket is mounted on the vehicle body, the second fixed bracket is mounted on the cargo door, and the second driver is hinged between the first fixed bracket and the second fixed bracket.

[0015] The beneficial effects of the stepped loading hatch provided in this application are partly the same as those in the specific implementation method, and will not be repeated here. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A perspective view of a stepped boarding door provided for an embodiment of this application; Figure 2 A perspective view of the door, support structure, and limiting mechanism of a stepped boarding door provided in an embodiment of this application; Figure 3 A perspective view of a stepped boarding door, a first step structure, and a second step structure provided for an embodiment of this application; Figure 4 This application provides a perspective sectional view of a stepped boarding door, including the door itself, the first step structure, and the second step structure. Figure 5 for Figure 2 A magnified view of a section at point A in the middle; Figure 6 for Figure 4 A magnified view of a section at point B in the middle; Figure 7 This is a cross-sectional view of the first and second step structures of a stepped boarding gate provided in an embodiment of this application.

[0018] The following are the labeling elements in the figure: 1. Storage door; 11. Mounting slot; 2. Drive assembly; 21. First fixed bracket; 22. Second fixed bracket; 23. Second driver; 3. First stepped structure; 31. First connecting plate; 32. First sliding sleeve; 33. First sleeve hole; 34. First sliding plate; 35. First sliding rod; 36. First rod hole; 37. First top plate; 4. Second stepped structure; 41. Second connecting plate; 42. Second sliding sleeve; 43. Second sleeve hole; 44. Second sliding plate; 45. Second sliding rod; 46. Second rod hole; 47. Second top plate; 5. Support structure; 51. First driver; 52. Limiting groove; 53. Rotary motor; 54. Support plate; 6. Limiting mechanism; 61. Limiting component; 611. Elastic element; 612. Locking ball; 62. Pin; 7. Drainage channel; 71. First plate groove; 72. First guide groove; 73. Internal drainage hole; 74. Second plate groove; 75. Second guide groove; 76. Second connecting channel; 77. First connecting channel. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "mounted to," "fixed to," or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] like Figures 1 to 7 As shown, this application provides a stepped loading hatch including a hatch 1, two drive components 2, a first step structure 3, a second step structure 4, two support structures 5, and two limiting mechanisms 6. The hatch 1 has a mounting groove 11. The two drive components 2 are installed on the hatch 1 and the vehicle body and are used to drive the hatch 1 to rotate. The first step structure 3 is installed on the hatch 1, and the second step structure 4 is installed at the end of the first step structure 3 away from the hatch 1. The two support structures 5 are hinged to the hatch 1 and are used to support the hatch 1. The two limiting mechanisms 6 are installed on the hatch 1 and can limit the two support structures 5 within the mounting groove 11, and are arranged in a one-to-one correspondence with the two support structures 5.

[0024] This application provides a stepped loading hatch, which, under the action of the drive assembly 2, allows the hatch 1 to rotate relative to the vehicle body, enabling the first step structure 3 and the second step structure 4 to rotate out from the vehicle body and also to be hidden within the vehicle body. This design offers a high degree of automation and convenient operation. The combined action of the first step structure 3 and the second step structure 4 facilitates easier loading for operators, and the internal storage spaces of the first step structure 3 and the second step structure 4 improve space utilization. The support structure 5 provides stable support for the hatch 1 when using the first step structure 3 and the second step structure 4, preventing injury to operators due to device damage during loading. The limiting mechanism 6 limits the support structure 5, allowing it to fold to the side of the hatch 1 during vehicle transport, preventing it from interfering with vehicle movement.

[0025] In one embodiment of this application, please refer to Figures 1 to 7The limiting mechanism 6 includes multiple limiting components 61, which are installed on the door 1 and can limit the bracket structure 5 within the mounting groove 11.

[0026] With this configuration, the bracket structure 5 can be limited by the limiting component 61, preventing the bracket structure 5 from falling out of the mounting slot 11 when the vehicle is in motion. Furthermore, the multiple limiting components 61 can make the bracket structure 5 more stable.

[0027] In one embodiment of this application, please refer to Figures 1 to 7 The limiting mechanism 6 also includes at least one pin 62, which passes through the door 1 and is able to limit the bracket structure 5 within the mounting groove 11.

[0028] With this configuration, the pin 62 can provide secondary positioning for the support structure 5, preventing it from falling out of the mounting groove 11 when it detaches from the positioning component 61, thus helping to further improve the structural stability between the support structure 5 and the door 1.

[0029] In one embodiment of this application, please refer to Figures 1 to 7 The bracket structure 5 includes a first driver 51 and multiple limiting grooves 52. The multiple limiting grooves 52 are all formed in the first driver 51 and are correspondingly set with multiple limiting components 61. The limiting component 61 includes an elastic element 611 and a locking ball 612. The elastic element 611 is installed on the door 1, and the locking ball 612 is installed on the end of the elastic element 611 away from the door 1 and can be engaged in the limiting groove 52.

[0030] With this configuration, the first actuator 51 can extend and retract the support structure 5, making the device more widely applicable. The combined action of the limiting groove 52, the elastic element 611, and the locking ball 612 confines the support structure 5 within the mounting groove 11, preventing it from falling out. Furthermore, the elastic element 611 acts as a buffer, preventing damage to the support structure 5 during operation.

[0031] Optionally, the elastic element 611 is configured as a spring or a sheet spring.

[0032] Optionally, the first actuator 51 is configured as a hydraulic cylinder.

[0033] In one embodiment of this application, please refer to Figures 1 to 7 The support structure 5 includes a rotary motor 53, a first driver 51, and a support plate 54. The rotary motor 53 is installed on the door 1, the first driver 51 is installed on the rotary motor 53 and rotates under the drive of the rotary motor 53, and the support plate 54 is installed on the output end of the first driver 51.

[0034] With this configuration, the first driver 51 can be rotated into the mounting slot 11 by the rotary motor 53, allowing it to be hidden within and rotated out relative to the slot. This design offers a high degree of automation and an aesthetically pleasing structure. The combined action of the first driver 51 and the support plate 54 enhances the overall load-bearing capacity of the device. Furthermore, the distance between the support plate 54 and the door 1 can be adjusted by the first driver 51, making it suitable for various terrains and thus expanding the device's applicability.

[0035] In one embodiment of this application, please refer to Figures 1 to 7 The first stepped structure 3 includes a first connecting plate 31, multiple first sliding sleeves 32, multiple first sleeve holes 33, a first sliding plate 34, multiple first sliding rods 35, multiple first rod holes 36, and a first top plate 37. The first connecting plate 31 and the multiple first sliding sleeves 32 are all installed on the door 1. Each first sliding sleeve 32 has multiple first sleeve holes 33. The first sliding plate 34 is slidably installed inside the first connecting plate 31. The multiple first sliding rods 35 are slidably installed on the multiple first sliding sleeves 32 and are arranged one-to-one with the multiple first sliding sleeves 32. Each first sliding rod 35 has a first rod hole 36. The first top plate 37 is installed at the end of the first sliding plate 34 away from the door 1 and at the end of the multiple first sliding rods 35 away from the door 1. The first rod hole 36 is configured to be aligned with any of the first sleeve holes 33. The first sliding rod 35 is configured to be limited to the first sliding sleeve 32 by a pin, the first sleeve hole 33, and the first rod hole 36.

[0036] With this configuration, the combined action of the first connecting plate 31, the first sliding plate 34, and the first top plate 37 allows for the storage of necessary materials. The combined action of the first sliding sleeve 32 and the first sliding rod 35 allows for the adjustment of the height of the first top plate 37, thereby adjusting the storage volume of the first stepped structure 3. The combined action of the pin, the first sleeve hole 33, and the first rod hole 36 allows the first sliding rod 35 to be locked after height adjustment, making the device more stable when personnel board the vehicle. This also makes the device suitable for personnel of different heights and allows for the movement of the first sliding plate 34 and the first top plate 37.

[0037] In one embodiment of this application, please refer to Figures 1 to 7The second stepped structure 4 includes a second connecting plate 41, multiple second sliding sleeves 42, multiple second sleeve holes 43, a second sliding plate 44, multiple second sliding rods 45, multiple second rod holes 46, and a second top plate 47. The second connecting plate 41 and the multiple second sliding sleeves 42 are all installed at the end of the first top plate 37 away from the door 1. Each second sliding sleeve 42 has multiple second sleeve holes 43. The second sliding plate 44 is slidably installed inside the second connecting plate 41. The multiple second sliding rods 45 are slidably installed in the multiple second sliding sleeves 42 and correspond one-to-one with the multiple first sliding sleeves 32. Each second sliding rod 45 has a second rod hole 46. The second top plate 47 is installed at the end of the second sliding plate 44 away from the door 1 and at the end of the multiple second sliding rods 45 away from the door 1. The second rod hole 46 is configured to be aligned with any of the second sleeve holes 43. The second sliding rod 45 is configured to be limited to the second sliding sleeve 42 by a pin (not shown in the figure), the second sleeve hole 43, and the second rod hole 46.

[0038] With this configuration, the combined action of the second connecting plate 41, the second sliding plate 44, and the second top plate 47 allows for the storage of necessary materials. The combined action of the second sliding sleeve 42 and the second sliding rod 45 allows for the adjustment of the height of the second top plate 47, thereby adjusting the storage volume of the second stepped structure 4. The combined action of the pin, the second sleeve hole 43, and the second rod hole 46 allows the second sliding rod 45 to be locked after height adjustment, making the device more stable when personnel board the vehicle. This also makes the device suitable for personnel of different heights and allows for the movement of the second sliding plate 44 and the second top plate 47.

[0039] In one embodiment of this application, please refer to Figures 1 to 7 A stepped boarding door also includes a drainage channel 7. The drainage channel 7 includes a plurality of first plate grooves 71, a first guide groove 72, and an internal drainage hole 73. The plurality of first plate grooves 71 are all opened in the door 1. The first guide groove 72 is opened in the door 1 and is located in the first connecting plate 31 and communicates with the plurality of first plate grooves 71. The internal drainage hole 73 is opened in the door 1 and communicates with the first guide groove 72. It is also configured to guide water in the first guide groove 72 to the side of the door 1 opposite to the drive assembly 2.

[0040] This design, with the action of the first plate groove 71, guides water flow into the first guide groove 72, preventing rainwater from remaining on the surface of the door 1 for extended periods and affecting material storage. The combined action of the first guide groove 72 and the internal drainage hole 73 allows water to be discharged. Furthermore, the multiple first plate grooves 71 improve drainage efficiency. Positioning the drainage holes on the side of the door 1, when the first stepped structure 3 and the second stepped structure 4 are concealed within the vehicle body, prevents water from flowing into the vehicle body (not shown in the figure) and damaging electronic components and parts inside. Additionally, the inclined arrangement of the first plate groove 71 and the first guide groove 72 allows for faster water discharge, further enhancing drainage efficiency.

[0041] In one embodiment of this application, please refer to Figures 1 to 7 The drainage channel 7 also includes multiple second plate grooves 74, second guide grooves 75, second connecting channels 76 and first connecting channels 77. The multiple second plate grooves 74 are all opened on the first top plate 37. The second guide grooves 75 are opened on the first top plate 37 and communicate with the multiple second plate grooves 74. The second connecting channel 76 is opened on the second connecting plate 41. The first connecting channel 77 is opened on the first sliding plate 34 and is used to connect the second connecting channel 76 and the internal drainage hole 73.

[0042] This design, with the action of the second plate groove 74, guides water flow into the second guide groove 75, preventing rainwater from remaining on the surface of the first top plate 38 for extended periods and affecting material storage. The combined action of the second guide groove 75, the second connecting channel 76, and the first connecting channel 77 guides water flow from the second stepped structure 4 into the internal drain hole 73, thereby draining the water without interfering with the volume adjustment functions of the first stepped structure 3 and the second stepped structure 4. The inclined arrangement of the second plate groove 74 and the second guide groove 75 allows for faster water discharge, improving drainage efficiency.

[0043] In one embodiment of this application, please refer to Figures 1 to 7 The drive assembly 2 includes a first fixed bracket 21, a second fixed bracket 22, and a second driver 23. The first fixed bracket 21 is installed on the vehicle body, the second fixed bracket 22 is installed on the door 1, and the second driver 23 is hinged between the first fixed bracket 21 and the second fixed bracket 22.

[0044] This configuration, through the combined action of the first fixed bracket 21, the second fixed bracket 22, and the second actuator 23, allows the cargo door 1, the first step structure 3, and the second step structure 4 to rotate relative to the vehicle body. This enables the first step structure 3 and the second step structure 4 to rotate out of the vehicle body and also to be concealed within the vehicle body, resulting in a high degree of automation and convenient operation. The first fixed bracket 21 and the second fixed bracket 22 also ensure greater stability for the second actuator 23 when driving the cargo door 1.

[0045] Optionally, the second actuator 23 is configured as a hydraulic cylinder.

[0046] The working principle of the stepped loading compartment door provided in this application is as follows: Before use, according to the height of the operator, the first set of holes 33 and the second set of holes 43 are inserted through the pin shaft, and the first rod hole 36 of the first slide rod 35 and the second rod hole 46 of the second slide rod 45 are inserted to adjust the height of the first top plate 37 and the second top plate 47. The first sliding plate 34 and the second sliding plate 44 are adjusted according to the amount of materials to be put in. After being adjusted to the appropriate position, the compartment door 1 is retracted into the vehicle body by the drive assembly 2. Upon reaching the designated position, the drive assembly 2 flips the hatch 1 out of the vehicle body, and the rotary motor 53 rotates the first drive 51 and the support plate 54 out of the mounting slot 11. Then, the height of the first drive 51 is adjusted according to the ground height so that the support plate 54 can contact the ground, allowing the operator to use the stepped loading hatch for work. During and after work, the water flow in the first step structure 3 and the second step structure 4 is guided into the first guide slot 72 and the second guide slot 75 through the first plate slot 71 and the second plate slot 74. The water flow in the second guide slot 75 flows into the internal drain hole 73 together with the water flow in the first guide slot 72 through the second connecting channel 76 and the first connecting channel 77, thereby draining the water. When the hatch 1 is closed, the water remaining in the internal drain hole 73 can also be discharged outside the vehicle through the internal drain hole 73. After the work is completed, the first driver 51 and the support plate 54 are retracted into the mounting groove 11 by rotating motor 53, the locking ball 612 is engaged into the limiting groove 52, and the pin 62 is inserted into the mounting groove 11. After the bracket structure 5 is limited, the door 1 is retracted into the body body by driving component 2.

[0047] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A stepped loading hatch, characterized in that, include: The warehouse door (1) is provided with an installation groove (11); Two drive components (2); the two drive components (2) are mounted on the cargo door (1) and the vehicle body and are used to drive the cargo door (1) to rotate; The first step structure (3) is installed on the door (1); The second step structure (4) is installed at the end of the first step structure (3) away from the door (1); Two support structures (5) are hinged to the door (1) and used to support the door (1). Two limiting mechanisms (6) are installed on the door (1) and can limit the two bracket structures (5) within the mounting groove (11), and are set one-to-one with the two bracket structures (5).

2. The stepped loading hatch as described in claim 1, characterized in that, The limiting mechanism (6) includes multiple limiting components (61), which are installed on the door (1) and can limit the bracket structure (5) within the mounting groove (11).

3. A stepped loading hatch as described in claim 1, characterized in that, The limiting mechanism (6) further includes at least one pin (62), which passes through the door (1) and is able to limit the bracket structure (5) within the mounting groove (11).

4. A stepped loading hatch as described in claim 2, characterized in that, The bracket structure (5) includes a first driver (51) and a plurality of limiting slots (52). The plurality of limiting slots (52) are all opened in the first driver (51) and are respectively configured to correspond to the plurality of limiting components (61). The limiting component (61) includes an elastic element (611) and a locking ball (612). The elastic element (611) is installed on the compartment door (1), and the locking ball (612) is installed at the end of the elastic element (611) away from the compartment door (1) and can be engaged in the limiting groove (52).

5. A stepped loading hatch as described in claim 1, characterized in that, The support structure (5) includes a rotary motor (53), a first driver (51) and a support plate (54). The rotary motor (53) is installed on the door (1), the first driver (51) is installed on the rotary motor (53) and rotates under the drive of the rotary motor (53), and the support plate (54) is installed at the output end of the first driver (51).

6. A stepped loading hatch as described in claim 1, characterized in that, The first stepped structure (3) includes a first connecting plate (31), a plurality of first sliding sleeves (32), a plurality of first sleeve holes (33), a first sliding plate (34), a plurality of first sliding rods (35), a plurality of first rod holes (36), and a first top plate (37). The first connecting plate (31) and the plurality of first sliding sleeves (32) are installed on the door (1). Each first sliding sleeve (32) is provided with a plurality of first sleeve holes (33). The first sliding plate (34) is slidably installed in the first connecting plate (31). The plurality of first sliding rods (35) are slidably installed on the plurality of first sliding sleeves (32) and are arranged in a one-to-one correspondence with the plurality of first sliding sleeves (32). Each first sliding rod (35) is provided with a first rod hole (36). The first top plate (37) is installed at the end of the first sliding plate (34) away from the door (1) and at the end of the plurality of first sliding rods (35) away from the door (1). The first rod hole (36) is configured to be aligned with any of the first sleeve holes (33), and the first slide rod (35) is configured to be limited to the first slide sleeve (32) by means of a pin, the first sleeve hole (33) and the first rod hole (36).

7. A stepped loading hatch as described in claim 6, characterized in that, The second stepped structure (4) includes a second connecting plate (41), a plurality of second sliding sleeves (42), a plurality of second sleeve holes (43), a second sliding plate (44), a plurality of second sliding rods (45), a plurality of second rod holes (46), and a second top plate (47). The second connecting plate (41) and the plurality of second sliding sleeves (42) are installed at the end of the first top plate (37) away from the door (1). Each second sliding sleeve (42) is provided with a plurality of second sleeve holes (43). The second sliding plate (44) is slidably installed in the second connecting plate (41). The plurality of second sliding rods (45) are slidably installed in the plurality of second sliding sleeves (42) and correspond one-to-one with the plurality of first sliding sleeves (32). Each second sliding rod (45) is provided with a second rod hole (46). The second top plate (47) is installed at the end of the second sliding plate (44) away from the door (1) and at the end of the plurality of second sliding rods (45) away from the door (1). The second rod hole (46) is configured to be aligned with any of the second sleeve holes (43), and the second slide rod (45) is configured to be limited to the second slide sleeve (42) by means of a pin, the second sleeve hole (43) and the second rod hole (46).

8. A stepped loading hatch as described in claim 7, characterized in that, The stepped loading compartment door also includes a drainage channel (7). The drainage channel (7) includes a plurality of first plate grooves (71), a first guide groove (72) and an internal drainage hole (73). The plurality of first plate grooves (71) are all opened in the door (1). The first guide groove (72) is opened in the door (1) and is located in the first connecting plate (31) and communicates with the plurality of first plate grooves (71). The internal drainage hole (73) is opened in the door (1) and communicates with the first guide groove (72). It is also configured to guide water in the first guide groove (72) to the side of the door (1) facing away from the drive assembly (2).

9. A stepped loading hatch as described in claim 8, characterized in that, The drainage channel (7) further includes multiple second plate grooves (74), second guide grooves (75), second connecting channels (76) and first connecting channels (77). The multiple second plate grooves (74) are all opened on the first top plate (37). The second guide grooves (75) are opened on the first top plate (37) and communicate with the multiple second plate grooves (74). The second connecting channel (76) is opened on the second connecting plate (41). The first connecting channel (77) is opened on the first sliding plate (34) and is used to connect the second connecting channel (76) and the internal drainage hole (73).

10. A stepped loading hatch as described in claim 1, characterized in that, The drive assembly (2) includes a first fixed bracket (21), a second fixed bracket (22), and a second driver (23). The first fixed bracket (21) is installed on the vehicle body, the second fixed bracket (22) is installed on the door (1), and the second driver (23) is hinged between the first fixed bracket (21) and the second fixed bracket (22).

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