Cargo box rear door structure of mining dump truck and mining dump truck

Abstract

The utility model provides a mining dump truck container rear door structure and a mining dump truck, and belongs to the technical field of mining wide-body dump trucks, the mining dump truck container rear door structure comprises a rear door main board, and the rear door main board is a corrugated board with a wave-shaped bend; an upper cross beam, a middle cross beam and a lower cross beam which are respectively connected with the vertical beams at the two ends are arranged on the inner side surface of the rear door main plate at intervals from top to bottom; the upper end of the rear door main plate is further provided with an upper cross beam upper reinforcing plate connected with the two vertical beams and the upper cross beam. The lower end of the rear door main plate is further provided with a lower cross beam lower reinforcing plate connected with the two vertical beams and the lower cross beam. According to the mining dump truck provided by the embodiment of the utility model, the corrugated board is adopted as the rear door main board, so that the mining dump truck has the advantages of simple structure, small welding quantity, low manufacturing cost, low dead weight and better appearance perception, and the problems of welding cracking and deformation of the rear door are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wide-body dump trucks for mining, and particularly relates to a cargo box rear door structure of a mining dump truck and the mining dump truck. Background Art

[0002] The existing rear door structure of wide-body mining dump trucks is a structure in which a large number of horizontal beams and vertical beams are welded on a flat plate to improve the rigidity of the rear door. This rear door structure with a large amount of welding has the following defects: (1) The large amount of welding makes it difficult to control welding deformation, and the increase in the amount of welding also leads to the risk of welding deformation and accumulation of welding stress on the rear door itself; (2) The large amount of welding also leads to a large consumption of raw materials and a long production and processing time; (3) In addition, the rear door style of existing wide-body mining dump trucks is single, which also affects the overall appearance visibility of the mining dump truck.

[0003] Therefore, the existing rear door structure has the problems of large welding volume, difficult to control deformation, low production efficiency, heavy weight, overall backwardness and high production cost. Utility Model Content

[0004] The embodiment of the utility model provides a mining dump truck cargo box rear door structure and a mining dump truck, aiming to reduce the problems of large welding amount of existing rear doors, such as rear door deformation, heavy weight and high cost.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a rear door structure of the cargo box of a mining dump truck, including: a rear door main board, the rear door main board is a corrugated board with a wave-shaped bend, and vertical beams are respectively provided at the left and right ends of the inner side surface of the rear door main board, and the inner side surface of the rear door main board is respectively provided with an upper cross beam, a middle cross beam and a lower cross beam connected to the vertical beams at both ends from top to bottom; the upper end of the rear door main board is also provided with an upper cross beam upper reinforcement plate connecting the two vertical beams and the upper cross beam; the lower end of the rear door main board is also provided with a lower cross beam lower reinforcement plate connecting the two vertical beams and the lower cross beam.

[0006] In combination with the first aspect, in one feasible method, an anti-smashing plate is also provided at the upper end of the upper cross beam, and the anti-smashing plate is wrapped around the upper end face and inner side face of the upper cross beam; and extends to the upper end face and inner side face of the vertical beam at the left and right ends, and wraps around the inner side face of the corner of the vertical beam and the upper cross beam; the reinforcing plate on the upper cross beam is wrapped inside the anti-smashing plate.

[0007] In combination with the first aspect, in a feasible manner, the lower side of the upper cross beam is also provided with an upper cross beam lower reinforcement plate connecting the two vertical beams and the upper cross beam; the upper cross beam lower reinforcement plate includes an upper cross beam lower reinforcement flat plate and an upper cross beam lower reinforcement angle plate, the upper cross beam lower reinforcement flat plate is attached to the lower side surface of the upper cross beam, and the upper cross beam lower reinforcement angle plate is arranged at the corner of the vertical beam and the upper cross beam.

[0008] In combination with the first aspect, in one feasible method, a lower cross beam upper reinforcement plate connecting the two vertical beams and the lower cross beam is further provided on the upper side of the lower cross beam, and the left and right ends of the lower cross beam upper reinforcement plate are respectively bent upward and fitted on the inner side surface of the vertical beam.

[0009] In combination with the first aspect, in a feasible manner, the upper and lower sides of the middle cross beam are respectively provided with a middle cross beam upper reinforcement plate and a middle cross beam lower reinforcement plate; the middle cross beam lower reinforcement plate includes a middle cross beam lower reinforcement flat plate and a middle cross beam lower reinforcement angle plate, the middle cross beam lower reinforcement flat plate is attached to the lower side surface of the middle cross beam, and the middle cross beam lower reinforcement angle plate is arranged at the corner of the vertical beam and the middle cross beam; the middle cross beam upper reinforcement plate and the middle cross beam lower reinforcement plate have the same structure.

[0010] In combination with the first aspect, in one feasible manner, the left and right ends of the lower reinforcement plate of the lower cross beam are respectively bent upward and attached to the outer side surface of the vertical beam.

[0011] In combination with the first aspect, in one feasible manner, a bent plate bent toward the inner side surface of the lower cross beam is provided on the lower reinforcement plate of the lower cross beam.

[0012] In combination with the first aspect, in one feasible manner, a middle reinforcing plate is provided between the middle cross beam and the vertical beams at the left and right ends, respectively, and the middle reinforcing plate is simultaneously attached to the inner side surfaces of the vertical beam and the middle cross beam.

[0013] In combination with the first aspect, in one feasible manner, lower reinforcing plates are respectively provided between the lower cross beam and the vertical beams at the left and right ends, and the lower reinforcing plates are simultaneously attached to the inner side surfaces of the vertical beam and the lower cross beam.

[0014] Compared with the prior art, the rear door structure of the cargo box of a mining dump truck provided by the present invention has the following advantages: (1) Compared with the problem of large welding amount in the prior art, the rear door main board adopts a corrugated plate processed by cold bending. The corrugated bending of the corrugated plate forms natural horizontal and vertical beams, which has the function of increasing the strength of the horizontal and vertical beams, thereby increasing the strength of the rear door main board, thereby reducing the number of horizontal and vertical beams used on the rear door, greatly reducing the welding amount, welding deformation and welding stress; (2) Compared with the problem of consumables and long production cycle, the present invention can reduce the number of horizontal and vertical beams used and the significant reduction in welding amount, thereby shortening the production cycle, reducing the consumption of raw materials and reducing production costs; (3) Compared with the problem of heavy weight, since the corrugated plate can be cold-bent into one piece, the bending position forms a natural horizontal and vertical beam structure, and no more reinforcement structure is required, thereby reducing the weight of the rear door, thereby reducing the weight of the entire vehicle; (4) The use of this corrugated plate as the rear door also changes the phenomenon of the single style of the existing door, and improves the visibility of the appearance of the mining dump truck.

[0015] In a second aspect, an embodiment of the present invention further provides a mining dump truck, comprising the aforementioned mining dump truck cargo box rear door structure.

[0016] The mining dump truck provided by the embodiment of the present invention adopts this corrugated board as the rear door main board, so it has a simple structure, small welding amount, low production cost, low weight and good appearance perception, which solves the problems of rear door welding cracking and rear door deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of the rear door structure of a cargo box of a mining dump truck provided by an embodiment of the present utility model (inside);

[0018] Figure 2 A schematic diagram of the three-dimensional structure of the rear door structure of a cargo box of a mining dump truck provided by an embodiment of the present utility model (outer side);

[0019] Figure 3 A schematic diagram of the exploded structure of the rear door structure of a cargo box of a mining dump truck provided by an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the main structure of the rear door structure of a cargo box of a mining dump truck provided by an embodiment of the utility model;

[0021] Figure 5 For the Figure 4 Cross-sectional structural diagram along line AA;

[0022] Figure 6 for Figure 5 Schematic diagram of the local enlarged structure at C in FIG;

[0023] Figure 7 For the Figure 4 Cross-sectional structural diagram along line BB;

[0024] Figure 8 for Figure 7 Schematic diagram of the local enlarged structure at D in FIG;

[0025] Figure 9 for Figure 7 Schematic diagram of the local enlarged structure at E in FIG;

[0026] Description of reference numerals:

[0027] 1. Rear door main board; 101. Rear door panel; 102. Rear door panel patch; 2. Anti-smash plate; 3. Upper crossbeam; 4. Upper crossbeam lower reinforcement plate; 401. Upper crossbeam lower reinforcement flat plate; 402. Upper crossbeam lower reinforcement angle plate; 5. Vertical beam; 6. Middle crossbeam upper reinforcement plate; 7. Middle crossbeam; 8. Middle reinforcement plate; 9. Lower crossbeam upper reinforcement plate; 10. Lower crossbeam; 11. Lower reinforcement plate; 12. Lower crossbeam lower reinforcement plate; 121. Bending plate; 13. Middle crossbeam lower reinforcement plate; 131. Middle crossbeam lower reinforcement flat plate; 132. Middle crossbeam lower reinforcement angle plate; 14. Upper crossbeam upper reinforcement plate. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] In the claims, specification and the above-mentioned drawings of the present utility model, the terms "up" and "down" are the same as the up and down directions of the vehicle body, the terms "front" and "rear" are the same as the front and rear directions of the vehicle body, and the terms "left" and "right" are the same as the left and right directions of the vehicle body. The remaining directional words, unless otherwise expressly defined, such as the use of terms such as "length", "width", "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside" and the like to indicate directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific protection scope of the present invention.

[0030] Please also refer to Figures 1 to 9The present invention will now describe the rear door structure for a mining dump truck cargo box. The rear door structure comprises a rear door main panel 1, which is formed of corrugated sheet metal with a wave-like bend. Vertical beams 5 are provided at the left and right ends of the inner side of the rear door main panel 1. An upper crossbeam 3, a middle crossbeam 7, and a lower crossbeam 10 are spaced apart from each other from top to bottom on the inner side of the rear door main panel 1, connected to the vertical beams 5 at both ends. An upper crossbeam reinforcement plate 14 is also provided at the upper end of the rear door main panel 1, connecting the two vertical beams 5 to the upper crossbeam 3. A lower crossbeam reinforcement plate 12 is also provided at the lower end of the rear door main panel 1, connecting the two vertical beams 5 to the lower crossbeam 10.

[0031] Compared with the prior art, the rear door structure of the cargo box of a mining dump truck provided by the present invention has the following advantages: (1) Compared with the problem of large welding amount in the prior art, the rear door main board 1 is made of corrugated sheet processed by cold bending. The corrugated bending of the corrugated sheet forms natural horizontal and vertical beams 5, which has the function of increasing the strength of the horizontal and vertical beams 5 and increases the strength of the rear door main board 1, thereby reducing the number of horizontal and vertical beams 5 used on the rear door and greatly reducing the welding amount, welding deformation and welding stress; (2) Compared with the problem of consumables and long production cycle, the present invention can reduce the number of horizontal and vertical beams 5 used and the welding amount, thus shortening the production cycle, reducing the consumption of raw materials and reducing production costs; (3) Compared with the problem of heavy weight, since the corrugated sheet can be cold-bent into one piece, the bending position forms a natural horizontal and vertical beam 5 structure, and no more reinforcement structure is required, thereby reducing the weight of the rear door and thus reducing the weight of the entire vehicle; (4) The use of the corrugated sheet with corrugated bending as the rear door also changes the phenomenon of the single style of the existing door and improves the visibility of the appearance of the mining dump truck.

[0032] The rear door of the cargo box of the mining dump truck of the present application breaks through the traditional concept and adopts a corrugated board with a wave-shaped bend as the rear door main board 1. It utilizes the characteristics of the corrugated board with light weight, high strength, rich color, and convenient and quick construction. Under the premise of ensuring the strength of the rear door, the number and amount of welding are reduced, thereby greatly reducing welding deformation and welding stress, reducing the consumption of raw materials, shortening the processing cycle, and improving production efficiency.

[0033] The rear door main board 1 of the present application adopts flat bending or cold bending into a corrugated structure, which can be bent 10 to 15 times, and through the cold bending processing technology with automatic angle control, it can not only ensure the bending angle, but also improve the production rhythm in the production process and increase production volume.

[0034] The bend shape can be triangle, trapezoid or arc; the bending angle of automatic cold bending can be set.

[0035] It needs to be explained that since the rear door main board 1 of the present application is a corrugated board with many corrugated bends, the upper crossbeam 3, the middle crossbeam 7 and the lower crossbeam 10 directly welded to the rear door main board 1 all have waveforms that are adapted to the waveforms on the rear door main board 1; similarly, the upper crossbeam upper reinforcement plate 14, the upper crossbeam lower reinforcement plate 4, the lower crossbeam lower reinforcement plate 12, the lower crossbeam upper reinforcement plate 9, the anti-smashing plate 2, the middle crossbeam upper reinforcement plate 6 and the middle crossbeam lower reinforcement plate 13 mentioned in the text all have waveforms that are adapted to the rear door main board 1, ensuring that all components welded to the rear door main board 1 are in close contact with the rear door main board 1. Components with such a corrugated structure can further enhance the deformation resistance of the rear door main board 1 and enhance the structural strength of the rear door.

[0036] The vertical beams 5 and cross beams welded around the rear door mainboard 1 are the main components that ensure the rigidity of the rear door mainboard 1. The connection between the vertical beams 5 and the cross beams is also strengthened by the upper cross beam upper reinforcement plate 14, the upper cross beam lower reinforcement plate 4, the lower cross beam lower reinforcement plate 12, the lower cross beam upper reinforcement plate 9, the anti-smash plate 2, the middle cross beam upper reinforcement plate 6, and the middle cross beam lower reinforcement plate 13, further enhancing the overall structural strength of the rear door.

[0037] Among them, the rear door main board 1 includes a rear door panel 101 and a rear door panel patch 102 at the lower end of the rear door panel 101, the lower cross beam 10 is welded to the rear door panel patch 102, and welding grooves are opened at the left and right ends of the rear door panel patch 102 to ensure welding strength.

[0038] In some embodiments, see Figures 1 to 4 The upper end of the upper crossbeam 3 is also provided with an anti-smash plate 2. The anti-smash plate 2 wraps around the upper end surface and inner side surface of the upper crossbeam 3, and extends to the upper end surface and inner side surface of the left and right vertical beams 5, and wraps around the inner side surface of the corner between the vertical beams 5 and the upper crossbeam 3; the upper crossbeam upper reinforcement plate 14 is wrapped inside the anti-smash plate 2. The upper end of the upper crossbeam 3 is a part that is easily bumped. Therefore, in addition to the upper crossbeam upper reinforcement plate 14, the anti-smash plate 2 is also wrapped around it, greatly improving the structural strength of the upper end of the rear door and improving its deformation resistance.

[0039] In some embodiments, see Figures 3 and 4 The lower side of the upper crossbeam 3 is also provided with an upper crossbeam lower reinforcement plate 4 that connects the two vertical beams 5 to the upper crossbeam 3. The upper crossbeam lower reinforcement plate 4 includes an upper crossbeam lower reinforcement flat plate 401 and an upper crossbeam lower reinforcement angle plate 402. The upper crossbeam lower reinforcement flat plate 401 is attached to the lower side of the upper crossbeam 3, and the upper crossbeam lower reinforcement angle plate 402 is provided at the corner between the vertical beam 5 and the upper crossbeam 3. The upper crossbeam lower reinforcement plate 4 and the upper crossbeam upper reinforcement plate 14 reinforce the upper crossbeam 3 from both the upper and lower sides, and also strengthen the connection between the upper crossbeam 3 and the vertical beam 5, thereby improving the structural strength of the upper portion of the rear door.

[0040] In some embodiments, see Figures 3 and 4 The upper side of the lower crossbeam 10 is also provided with a lower crossbeam upper reinforcement plate 9 that connects the two vertical beams 5 and the lower crossbeam 10. The left and right ends of the lower crossbeam upper reinforcement plate 9 are respectively bent upward and attached to the inner side surfaces of the vertical beams 5. The lower crossbeam lower reinforcement plate 12 and the lower crossbeam upper reinforcement plate 9 also reinforce the lower crossbeam 10 from both the upper and lower sides, and also strengthen the connection between the lower crossbeam 10 and the vertical beams 5, thereby improving the structural strength of the lower part of the rear door.

[0041] In some embodiments, see Figures 3 and 4 The upper and lower sides of the middle cross beam 7 are respectively provided with a middle cross beam upper reinforcement plate 6 and a middle cross beam lower reinforcement plate 13; the middle cross beam lower reinforcement plate 13 includes a middle cross beam lower reinforcement flat plate 131 and a middle cross beam lower reinforcement angle plate 132. The middle cross beam lower reinforcement flat plate 131 is attached to the lower side surface of the middle cross beam 7, and the middle cross beam lower reinforcement angle plate 132 is arranged at the corner of the vertical beam 5 and the middle cross beam 7; the middle cross beam upper reinforcement plate 6 and the middle cross beam lower reinforcement plate 13 have the same structure.

[0042] The lower center beam reinforcement plate 13 and the upper center beam reinforcement plate 6 of the present application also reinforce the center beam 7 from both the upper and lower sides of the center beam 7, and also strengthen the connection between the center beam 7 and the vertical beam 5, thereby improving the structural strength of the middle part of the rear door. Therefore, the present application strengthens the three rear door beams (upper, middle, and lower) and the connection between each beam and the vertical beam 5, thereby improving the overall structural strength of the rear door.

[0043] In this application, the upper crossbeam upper reinforcement plate 14, the upper crossbeam lower reinforcement plate 4, the lower crossbeam lower reinforcement plate 12, the lower crossbeam upper reinforcement plate 9, the anti-smashing plate 2, the middle crossbeam upper reinforcement plate 6 and the middle crossbeam lower reinforcement plate 13 are respectively connected between the corresponding vertical beam 5 and the crossbeam, which strengthens the overall strength of the rear door, and these reinforcement plates are all provided with welding process holes, which can improve the welding strength.

[0044] In some embodiments, see Figures 3 and 4 The left and right ends of the lower cross beam lower reinforcement plate 12 are bent upward and attached to the outer surface of the vertical beam 5 to improve the connection strength between the vertical beam 5 and the lower cross beam 10.

[0045] It should be noted that for the U-shaped cargo box of a mining dump truck, the present application provides avoidance bevels at the lower ends of the left and right vertical beams 5. In the area above and below the avoidance bevels, the two avoidance bevels are welded to the left and right inner sides of the rear door panel filler plate 102. To enhance the connection strength between the vertical beam 5 and the lower crossbeam 10, the lower crossbeam lower reinforcement plate 12 also extends upward to the left and right vertical sides of the vertical beam 5 in accordance with the avoidance bevels.

[0046] In some embodiments, see Figures 3 and 4, a bending plate 121 bent toward the inner side of the lower crossbeam 10 is provided on the lower crossbeam lower reinforcement plate 12. The lower crossbeam lower reinforcement plate 12 is bent upward to form two bending plates 121 to ensure the hanging strength of the rear door locking hook.

[0047] In some embodiments, see Figures 3 and 4 A middle reinforcing plate 8 is respectively provided between the middle cross beam 7 and the vertical beams 5 at the left and right ends. The middle reinforcing plate 8 is simultaneously attached to the inner side surfaces of the vertical beam 5 and the middle cross beam 7 to further strengthen the connection between the left and right ends of the middle cross beam 7 and the vertical beam 5.

[0048] In some embodiments, see below Figures 3 and 4 A lower reinforcement plate 11 is respectively provided between the cross beam and the vertical beams 5 at the left and right ends. The lower reinforcement plate 11 is simultaneously attached to the inner side surfaces of the vertical beam 5 and the lower cross beam 10.

[0049] The present application has two vertical beams 5 and three horizontal beams, with a total of six intersections. While being reinforced by various reinforcing plates, independent reinforcing plates are also set for the six intersections (the reinforcing plates at the left and right ends of the upper horizontal beam 3 are formed by extending the anti-smashing plate 2), which are welded to the intersection of each vertical beam 5 and the horizontal beam, thereby improving the local strength of the rear door, effectively dispersing stress, and avoiding the risk of stress concentration at the corners where the vertical beams 5 and the horizontal beams are connected, causing structural damage.

[0050] It should be noted that all components of the present application are connected by welding. In order to improve the strength of welding, the rear door of the present application is reinforced with multiple reinforcing plates, and the reinforcing plates (including the upper reinforcing plate 14 of the upper crossbeam, the lower reinforcing plate 4 of the upper crossbeam, the lower reinforcing plate 12 of the lower crossbeam, the upper reinforcing plate 9 of the lower crossbeam, the anti-smashing plate 2, the upper reinforcing plate 6 of the middle crossbeam and the lower reinforcing plate 13 of the middle crossbeam, and also including the upper reinforcing plate and the middle reinforcing plate 8) are provided with multiple plug welding holes, which can effectively enhance the connection strength and ensure the stability of the rear door structure. At the same time, it can also disperse stress and avoid the risk of structural damage caused by stress concentration.

[0051] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0052] Based on the same inventive concept, an embodiment of the present application also provides a mining dump truck, including the aforementioned mining dump truck cargo box rear door structure.

[0053] The mining dump truck provided by the embodiment of the present invention adopts this corrugated board as the rear door main board, so it has a simple structure, small welding amount, low production cost, low weight and good appearance perception, which solves the problems of rear door welding cracking and rear door deformation.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mining dump truck cargo box rear door structure, characterized in that: include: A rear door main board (1) is a corrugated board with a wave-shaped bend, and vertical beams (5) are respectively provided at the left and right ends of the inner side surface of the rear door main board (1), and an upper cross beam (3), a middle cross beam (7) and a lower cross beam (10) are respectively provided at intervals from top to bottom on the inner side surface of the rear door main board (1), which are connected to the vertical beams (5) at the two ends; an upper cross beam upper reinforcement plate (14) connecting the two vertical beams (5) and the upper cross beam (3) is also provided at the upper end of the rear door main board (1); and a lower cross beam lower reinforcement plate (12) connecting the two vertical beams (5) and the lower cross beam (10) is also provided at the lower end of the rear door main board (1).

2. The rear door structure of a mining dump truck cargo box according to claim 1, characterized in that: The upper end of the upper crossbeam (3) is also provided with an anti-smashing plate (2), which is wrapped around the upper end surface and inner side surface of the upper crossbeam (3); and extends to the upper end surface and inner side surface of the vertical beams (5) at the left and right ends, and wraps around the inner side surface of the corner between the vertical beams (5) and the upper crossbeam (3); the upper crossbeam reinforcement plate (14) is wrapped inside the anti-smashing plate (2).

3. The rear door structure of a mining dump truck cargo box according to claim 1, characterized in that: The lower side of the upper crossbeam (3) is also provided with an upper crossbeam lower reinforcement plate (4) connecting the two vertical beams (5) and the upper crossbeam (3); the upper crossbeam lower reinforcement plate (4) includes an upper crossbeam lower reinforcement flat plate (401) and an upper crossbeam lower reinforcement angle plate (402), the upper crossbeam lower reinforcement flat plate (401) is attached to the lower side surface of the upper crossbeam (3), and the upper crossbeam lower reinforcement angle plate (402) is provided at the corner between the vertical beam (5) and the upper crossbeam (3).

4. The rear door structure of a mining dump truck cargo box according to claim 1, characterized in that: A lower crossbeam upper reinforcement plate (9) connecting the two vertical beams (5) and the lower crossbeam (10) is also provided on the upper side of the lower crossbeam (10), and the left and right ends of the lower crossbeam upper reinforcement plate (9) are respectively bent upwards and attached to the inner side surfaces of the vertical beams (5).

5. The rear door structure of a mining dump truck cargo box according to claim 1, characterized in that: The upper side and lower side of the middle cross beam (7) are respectively provided with a middle cross beam upper reinforcement plate (6) and a middle cross beam lower reinforcement plate (13); the middle cross beam lower reinforcement plate (13) includes a middle cross beam lower reinforcement flat plate (131) and a middle cross beam lower reinforcement angle plate (132); the middle cross beam lower reinforcement flat plate (131) is attached to the lower side surface of the middle cross beam (7), and the middle cross beam lower reinforcement angle plate (132) is provided at the corner between the vertical beam (5) and the middle cross beam (7); the middle cross beam upper reinforcement plate (6) and the middle cross beam lower reinforcement plate (13) have the same structure.

6. The rear door structure of a cargo box of a mining dump truck according to claim 1, characterized in that: The left and right ends of the lower cross beam lower reinforcement plate (12) are respectively bent upwards and attached to the outer side surface of the vertical beam (5).

7. The rear door structure of a cargo box of a mining dump truck according to claim 6, characterized in that: The lower cross beam lower reinforcement plate (12) is provided with a bent plate (121) bent toward the inner side surface of the lower cross beam (10).

8. The rear door structure of a cargo box of a mining dump truck according to claim 1, characterized in that: A middle reinforcement plate (8) is provided between the middle cross beam (7) and the vertical beams (5) at the left and right ends, respectively. The middle reinforcement plate (8) is simultaneously attached to the inner side surfaces of the vertical beams (5) and the middle cross beam (7).

9. The rear door structure of a cargo box of a mining dump truck according to claim 1, characterized in that: Lower reinforcement plates (11) are respectively provided between the lower cross beam (10) and the vertical beams (5) at the left and right ends, and the lower reinforcement plates (11) are simultaneously attached to the inner side surfaces of the vertical beam (5) and the lower cross beam (10).

10. A mining dump truck, characterized in that: It comprises the cargo box rear door structure of a mining dump truck as described in any one of claims 1 to 9.

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