Aluminum alloy self-unloading truck rear door and composite connecting structure thereof

Abstract

The utility model provides a kind of aluminum alloy dump truck rear door and its composite connecting structure, belong to dump truck compartment manufacturing technical field, technical scheme is, a kind of aluminum alloy dump truck rear door, including aluminum alloy rear door panel, the left side edge, right side edge and bottom edge of aluminum alloy rear door panel are respectively embedded in the U type groove of rear door left side beam, rear door right side beam and rear door lower crossbeam, then fixed by welding, corrugated reinforcing lining and aluminum alloy rear door panel form honeycomb support structure, can strengthen structural strength.A kind of composite connecting structure of aluminum alloy dump truck rear door, the end portion of rear door upper crossbeam close to rear door left side beam is equipped with rear door turnover hinge seat one, rear door turnover hinge seat one is rotatably connected with rear door bidirectional hinge shaft, can realize bidirectional opening.Affirmative effect lies in, aluminum alloy dump truck rear door and its composite connecting structure, by aluminum alloy material and honeycomb support structure to enhance its strength and control weight, while realizing dump truck rear door bidirectional opening.

Description

Technical Field

[0001] This utility model belongs to the field of dump truck body manufacturing technology, specifically relating to an aluminum alloy dump truck rear door and its composite connection structure. Background Technology

[0002] Dump trucks are core equipment in engineering transportation, mineral transshipment, and other scenarios. The rear door of the truck bed, as a key component, plays an important role in ensuring cargo loading and unloading efficiency and transportation safety. In actual operation, the rear door needs to rely on specific opening methods such as side opening and tilting, in conjunction with the lifting action of the truck bed, to complete the rapid unloading of goods. Its opening flexibility and adaptability directly determine the overall operating efficiency of the vehicle and its ability to adapt to different working conditions.

[0003] Currently, according to the patent with authorization announcement number CN220465325U, the disclosed dump truck rear door structure has three side-opening hinges fixedly connected on the right side. By rotating the side-opening hinges in conjunction with the side panel of the truck body, the rear door can be opened to the side, thus meeting the usage requirements of conventional narrow passage and single-side unloading scenarios. At the same time, the top and bottom of the rear door baffle are fixedly connected with reinforcing square steel, and several transverse reinforcing ribs are also set at intervals at the top and bottom ends of the baffle to improve the impact resistance and deformation resistance of the dump truck rear door.

[0004] However, existing dump truck rear doors have shortcomings. On the one hand, both the reinforcing square steel and the reinforcing ribs are made of steel, and in order to ensure structural strength, a large cross-sectional size needs to be designed. This directly leads to a significant increase in the overall weight of the rear door, which not only affects the overall vehicle's lightweight level, but also causes rust problems due to the characteristics of steel, thus shortening the service life of the rear door. On the other hand, the rear door opening method is relatively simple, only able to open and close on one side, either side opening or flipping opening and closing, which has strong functional limitations and is difficult to adapt to the unloading needs of multiple working conditions. Utility Model Content

[0005] This utility model addresses the problems of existing dump truck rear doors using steel reinforcement materials, which result in significant weight, hindering lightweight vehicle design, and limiting the opening direction. It provides an aluminum alloy dump truck rear door and its composite connection structure, which effectively enhances the structural strength of the aluminum alloy rear door panel without significantly increasing its weight, and enables bidirectional opening of the dump truck rear door.

[0006] Firstly, to solve the above problems, the technical solution adopted by this utility model is as follows: an aluminum alloy dump truck rear door, including an aluminum alloy rear door panel, with a left rear door beam, a right rear door beam, and a lower rear door crossbeam respectively fitted on the left, right, and bottom sides of the aluminum alloy rear door panel. The left rear door beam, the right rear door beam, and the lower rear door crossbeam each include mutually perpendicular web plates and flange plates. The web plates are provided with integrally formed outward and inward convex ribs, and the height of the outward convex ribs is higher than that of the inward convex ribs. A U-shaped groove is formed between the outward and inward convex ribs. The left, right, and bottom edges of the aluminum alloy rear door panel are respectively embedded into the U-shaped grooves of the left rear door beam, the right rear door beam, and the lower rear door crossbeam, and are fixed by welding. A rear door upper crossbeam is welded to the top outer side of the aluminum alloy rear door panel, and a corrugated reinforcing liner is welded to the inner side of the aluminum alloy rear door panel. A honeycomb support structure is formed between the corrugated reinforcing liner and the aluminum alloy rear door panel.

[0007] In this technical solution, the left, right, and bottom sides of the aluminum alloy rear door panel are respectively equipped with a left rear door beam, a right rear door beam, and a lower rear door crossbeam. Each of these beams includes a web and flange plates that are perpendicular to each other. The web has integrally formed outward and inward convex ribs. This integral design enhances structural strength, and the outward ribs, being higher than the inward ribs, strengthen the protection of the aluminum alloy rear door panel. A U-shaped groove is formed between the outward and inward ribs. The left, right, and bottom edges of the aluminum alloy rear door panel are respectively embedded into the U-shaped grooves of the left, right, and lower rear door beams, and then fixed by welding. This insertion-then-welding connection method further improves the connection strength. Simultaneously, a corrugated reinforcing liner is welded to the inner side of the aluminum alloy rear door panel. The corrugated reinforcing liner and the aluminum alloy rear door panel form a honeycomb support structure, further strengthening the structural strength without significantly increasing the weight of the aluminum alloy rear door panel. In summary, by using aluminum alloy material combined with a honeycomb support structure, the rear door of this aluminum alloy dump truck can effectively enhance its overall structural strength without significantly increasing the weight of the aluminum alloy rear door panel.

[0008] Furthermore, rounded transition structures are provided at the left and right corners of the bottom of the aluminum alloy rear door panel. Each rounded transition structure has a bottom-edge connecting arc-shaped plate fitted onto its outer side. The bottom-edge connecting arc-shaped plate is welded and fixed to the rounded transition structure. One end of the bottom-edge connecting arc-shaped plate is welded and fixed to the web of the corresponding left or right rear door beam, and the other end is welded and fixed to the web of the lower rear door crossbeam. Rear door bottom corner plates are welded between the flange plates of the left or right rear door beams and the flange plates of the lower rear door crossbeam. This enhances the overall integrity of the corner structure. The bottom edge connecting arc plate is designed for the rounded transition structure at the left and right corners of the rear door, connecting the web plate of the left or right rear door beam to the web plate of the lower rear door crossbeam. Simultaneously, the bottom corner plate connects the flange plate of the left or right rear door beam to the flange plate of the lower rear door crossbeam, forming a dual connection path of web plate and flange plate. This firmly connects the left, right, and lower rear door beams with the rounded transition structure into a closed, integrated frame, avoiding the risk of structural separation under stress at a single connection point. Improved overall structural rigidity: Through the dual connection and integrated frame design, the left, right, and lower rear door beams are no longer independent load-bearing components, but form a mutually supporting rigid system. This better resists the bumps and vibrations during dump truck transportation, as well as the material impact on the rear door during unloading, ensuring that the rear door is not easily deformed under long-term heavy load conditions, maintaining smooth opening and closing and structural stability.

[0009] Furthermore, the corrugated reinforcing liner has a plate-like structure with flat sections on both sides and several triangular protrusions spaced along its length in the middle. The two sides of each triangular protrusion are perpendicular to each other, and their protrusion direction is away from the aluminum alloy rear door panel, forming a hollow cavity between the triangular protrusions and the aluminum alloy rear door panel. This enhances the structural support strength. The flat sections on both sides of the corrugated reinforcing liner can stably fit the connection parts, and the triangular protrusions spaced in the middle, due to their perpendicular sides, form a triangular structure with rigid support capacity, effectively dispersing the external force borne by the aluminum alloy rear door panel and improving the overall resistance to deformation. This achieves a balance between lightweight and strength. The triangular protrusions protrude away from the aluminum alloy rear door panel, forming a hollow cavity with it. While ensuring the corrugated reinforcing liner's support effect on the aluminum alloy rear door panel, it reduces material usage and avoids a significant increase in structural weight, meeting the requirements of lightweight design.

[0010] Furthermore, the left edge of the corrugated reinforcing liner is welded and fixed to the inner bulge of the left beam of the rear door, the right edge is welded and fixed to the inner bulge of the right beam of the rear door, the bottom edge is welded and fixed to the inner bulge of the lower crossbeam of the rear door, and the bottom corner is welded and fixed to the curved plate connecting to the bottom edge. This constructs a comprehensive load-bearing support system. The left edge of the corrugated reinforcing liner is welded to the inner bulge of the left beam of the rear door, the right edge is welded to the inner bulge of the right beam of the rear door, and the bottom edge is welded to the inner bulge of the lower crossbeam of the rear door. Through connections to the inner bulges of the side beams and lower crossbeams in the left, right, and lower directions, the supporting force of the corrugated reinforcing liner is evenly transferred to the frame structure of the rear door, preventing deformation due to lack of support when the aluminum alloy rear door panel is under localized stress. Simultaneously, the bottom corner is welded to the curved plate connecting to the bottom edge, further covering this stress-concentrated area at the bottom corner of the rear door, forming a comprehensive load-bearing support network. This strengthens the overall structural coherence. The inner convex ribs themselves possess a certain structural strength. Welding the corrugated reinforcing liner to the inner convex ribs of the left beam, right beam, and lower crossbeam of the rear door can enhance the tear resistance of the connection points by utilizing the rigidity of the inner convex ribs, making the corrugated reinforcing liner, side beam, and lower crossbeam form a stable whole. Furthermore, the welding with the arc-shaped plate connecting to the bottom edge links the corrugated reinforcing liner to the arc transition structure at the bottom of the rear door, allowing the rear door frame, arc transition components, and internal reinforcing liner to form a mutually restraining and synergistic force-bearing structural system, significantly improving the overall impact resistance of the rear door.

[0011] Furthermore, a top reinforcing beam is welded to the top of the upper crossbeam of the rear door. This enhances the bending resistance of the upper crossbeam. As a key load-bearing component at the top of the rear door, the upper crossbeam is susceptible to longitudinal or lateral external forces during the opening, closing, and unloading processes of the rear door, and may bend or deform over long-term use. The top reinforcing beam, welded to the top of the upper crossbeam, directly provides additional rigid support, offsetting some of the compression or tension exerted on the upper crossbeam by external forces, significantly reducing the risk of bending and maintaining its structural stability.

[0012] Furthermore, the top reinforcing beam is a right-angled folded plate structure, with its corners facing away from the upper crossbeam of the rear door. The bottom two edges of the top reinforcing beam are welded and fixed to the top of the upper crossbeam of the rear door. This optimizes the structural stress performance. The right-angled folded plate structure of the top reinforcing beam inherently possesses strong torsional and bending rigidity, effectively resisting deformation under external forces. Its corners facing away from the upper crossbeam of the rear door create outward-extending support structures on both sides of the right-angled folded plate, further expanding the stress coverage of the top reinforcing beam. When the top of the rear door is subjected to impact or pressure, it can more efficiently disperse the force, avoiding localized stress concentration.

[0013] Furthermore, two vertically arranged longitudinal beams are welded to the outer side of the aluminum alloy rear door panel. These two beams are symmetrically distributed about the longitudinal center plane of the aluminum alloy rear door panel. The top of each longitudinal beam is welded and fixed to the upper crossbeam of the rear door, and the bottom is welded and fixed to the lower crossbeam of the rear door. This constructs a longitudinal rigid support frame. The two vertically arranged longitudinal beams, welded to the outer side of the aluminum alloy rear door panel, provide longitudinal support along the height of the panel, effectively resisting the longitudinal tensile and compressive forces exerted on the panel during opening, transportation, or unloading. This prevents deformation problems such as central dents and edge warping due to a lack of longitudinal support. Simultaneously, the top of each longitudinal beam is welded to the upper crossbeam, and the bottom to the lower crossbeam, connecting the upper and lower crossbeams to the aluminum alloy rear door panel to form a complete rigid frame, further enhancing the overall deformation resistance of the rear door.

[0014] Furthermore, an inclined intermediate support plate is installed between the two rear door longitudinal beams. The top edge of the intermediate support plate is welded and fixed to the outer side of the aluminum alloy rear door panel, and the bottom edge is welded and fixed to the lower crossbeam of the rear door. An inclined side support plate is installed on the side of each rear door longitudinal beam away from the intermediate support plate. The top edge of the side support plate is welded and fixed to the outer side of the aluminum alloy rear door panel, and the bottom edge is welded and fixed to the lower crossbeam and the bottom corner plate of the rear door, respectively. This constructs a three-dimensional support network to enhance the deformation resistance of the aluminum alloy rear door panel. The intermediate support plate obliquely connects the aluminum alloy rear door panel between the two rear door longitudinal beams and the lower crossbeam of the rear door, while the side support plates obliquely connect the aluminum alloy rear door panel on the outer side of each rear door longitudinal beam to the lower crossbeam and the bottom corner plate of the rear door, forming multiple sets of inclined support structures in the middle and on both sides. These inclined support plates can radiate support from the lower middle part of the aluminum alloy rear door panel to the outer frame, effectively resisting the lateral and longitudinal pressure generated when the aluminum alloy rear door panel is subjected to material impact or transportation bumps, avoiding deformation problems such as bulging in the middle or local dents in the aluminum alloy rear door panel, and greatly improving its planar stability.

[0015] Furthermore, a clearance groove is provided on the upper part of the left side beam of the rear door, located on the side of the left side beam away from the aluminum alloy rear door panel. During the side opening of the rear door, the left side beam rotates with the door body around the side opening hinge, and the hinge structure needs to allow for a certain amount of movement. The clearance groove, located on the side of the left side beam away from the aluminum alloy rear door panel, provides sufficient clearance for the hinge structure during rotation, directly preventing a hard collision or friction between the left side beam and the hinge structure during side opening, ensuring smooth side opening of the rear door without any jamming.

[0016] Secondly, this utility model also provides a composite connection structure for the rear door of an aluminum alloy dump truck. The rear door upper crossbeam has a rear door flip hinge seat two installed at the end near the right side beam of the rear door. A rear door flip hinge shaft is rotatably installed inside the rear door flip hinge seat two. A rear door flip hinge seat one is installed at the end of the rear door upper crossbeam near the left side beam of the rear door. The rear door flip hinge seat one is rotatably connected to one end of the rear door bidirectional hinge shaft, and the other end of the rear door bidirectional hinge shaft is rotatably connected to a hinge shaft sleeve. The hinge shaft sleeve can be fixedly connected to the truck body. A rear door side-opening hinge seat is installed at the end of the left side beam of the rear door near the lower crossbeam of the rear door.

[0017] In this technical solution, the rear door can achieve two opening and closing methods: flipping and side opening. When flipping is required, the rear door side opening hinge seat is separated from the hinge shaft on the carriage. The rear door flipping hinge seat one and the rear door flipping hinge seat two on the rear door can rotate around the rear door bidirectional hinge shaft and the rear door flipping hinge shaft, respectively, thereby realizing the flipping opening and closing of the rear door. When side opening is required, the rear door flipping hinge shaft on the rear door flipping hinge seat two is separated from the carriage. The hinge shaft sleeve on the rear door and the rear door side opening hinge seat can rotate around the rear door bidirectional hinge shaft and the hinge shaft on the carriage, respectively, thereby realizing the side opening and closing of the rear door.

[0018] As can be seen from the above technical solution, the advantages of this utility model are as follows: In this technical solution, on the one hand, the strength of the rear door is enhanced by multiple structures: the left side beam, the right side beam, and the lower crossbeam of the rear door are respectively assembled on the left, right, and bottom of the aluminum alloy rear door panel. All three contain mutually perpendicular web plates and flange plates. The web plate has integrally formed outward and inward convex ribs. The height of the outward convex rib is higher than that of the inward convex rib, which can improve the structural strength and protect the aluminum alloy rear door panel. The outward and inward convex ribs form a U-shaped groove, which is embedded in the edge of the aluminum alloy rear door panel and then welded and fixed. Insertion before welding improves the connection strength. At the same time, a corrugated reinforcing liner is welded to the inner side of the aluminum alloy rear door panel. The two form a honeycomb support structure, which enhances the strength without significantly increasing the weight of the aluminum alloy rear door panel. On the other hand, it achieves bidirectional opening and closing of the rear door: during tilting and opening, the rear door side-opening hinge seat separates from the hinge shaft on the truck body, and rear door tilting hinge seat one and rear door tilting hinge seat two rotate around the rear door bidirectional hinge shaft and the rear door tilting hinge shaft, respectively; during side opening and closing, the rear door tilting hinge shaft on rear door tilting hinge seat two separates from the truck body, and the hinge shaft sleeve and rear door side-opening hinge seat rotate around the rear door bidirectional hinge shaft and the hinge shaft on the truck body, respectively. In summary, the aluminum alloy dump truck rear door and its composite connection structure enhance the strength of the aluminum alloy rear door panel and control its weight through the aluminum alloy material and honeycomb support structure, while simultaneously achieving bidirectional opening of the dump truck rear door. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view structural diagram of a specific embodiment of the present utility model; Figure 2 This is a schematic diagram of the axonal structure of a specific embodiment of the present utility model; Figure 3 for Figure 1 AA sectional view; Figure 4 for Figure 1 BB cross-sectional diagram; Figure 5 This is a schematic diagram of the cross-section of the left rear door beam, the right rear door beam, or the lower rear door beam in a specific embodiment of this utility model. Figure 6 for Figure 1 DD cross-sectional view; Figure 7 for Figure 6 A magnified view of a portion of point C.

[0021] In the diagram: 1. Aluminum alloy rear door panel; 2. Left rear door beam; 3. Lower rear door crossbeam; 4. Right rear door beam; 5. Upper rear door crossbeam; 6. Rear door longitudinal beam; 7. Corrugated reinforcing liner; 8. Bottom edge connecting arc plate; 9. Rear door bottom corner plate; 10. Rear door flip hinge shaft; 11. Rear door flip hinge seat two; 12. Rear door flip hinge seat one; 13. Rear door bidirectional hinge shaft; 14. Rear door side opening hinge seat; 15. Side support plate; 16. Middle support plate; 17. Top reinforcing beam; 18. Web plate; 19. Flange plate; 20. Outer rib; 21. Inner rib; 22. U-shaped groove; 23. Arc transition structure; 24. Triangular protrusion; 25. Clearance groove; 26. Hinge shaft sleeve. Detailed Implementation

[0022] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] Example 1: An aluminum alloy dump truck rear door, such as Figure 1As shown, the rear door panel 1 is made of aluminum alloy. As the core load-bearing panel of the rear door, the rear door panel 1 is equipped with a left rear door beam 2, a right rear door beam 4, and a lower rear door crossbeam 3 on its left, right, and bottom sides, respectively. The three of them together form the frame support structure of the lower and side parts of the aluminum alloy rear door panel 1. At the same time, the upper rear door crossbeam 5 is fixed to the top outer side of the aluminum alloy rear door panel 1 by welding. The upper rear door crossbeam 5, together with the left rear door beam 2 and the right rear door beam 4, forms the complete frame of the aluminum alloy rear door panel 1. The inner side of the aluminum alloy rear door panel 1 is welded with a corrugated reinforcing liner 7. The corrugated reinforcing liner 7 is tightly attached to the aluminum alloy rear door panel 1 to form a honeycomb support structure. The honeycomb support structure can provide internal support for the aluminum alloy rear door panel 1 without adding too much weight.

[0024] like Figure 5 As shown, in this specific embodiment, the left rear door beam 2, the right rear door beam 4, and the lower rear door crossbeam 3 all include mutually perpendicular web plates 18 and flange plates 19. The web plates 18 and flange plates 19 are manufactured using an integrated processing technology, resulting in an L-shaped overall structure after processing. This integrated design effectively enhances the structural rigidity of the three components, avoiding the risk of breakage that easily occurs in spliced ​​structures under stress. Furthermore, on the side of the web plate 18 near the aluminum alloy rear door panel 1, there are also integrally formed outward-protruding ribs 20 and inward-protruding ribs 21. The height of the outward-protruding rib 20 is higher than that of the inward-protruding rib 21, and a U-shaped groove 22 is naturally formed between the outward-protruding rib 20 and the inward-protruding rib 21. The left, right, and bottom edges of the aluminum alloy rear door panel 1 are... The aluminum alloy rear door panel 1 is embedded into the U-shaped groove 22 of the left rear door beam 2, the right rear door beam 4, and the lower rear door crossbeam 3. After being embedded, it is fixed by welding. This method of first embedding and then welding greatly improves the connection strength between the aluminum alloy rear door panel 1 and the frame, ensuring that the two are not easily separated during long-term stress. In addition, a clearance groove 25 is specially set on the upper part of the left rear door beam 2. The clearance groove 25 is located on the side of the left rear door beam 2 away from the aluminum alloy rear door panel 1. The size and position of the clearance groove 25 are precisely designed to provide sufficient clearance space for the hinge structure involved in the side opening and closing of the rear door, thereby directly avoiding hard collision or friction between the left rear door beam 2 and the hinge structure during the side opening action, ensuring the smoothness of the side opening and closing of the rear door.

[0025] To further enhance the structural stability of the bottom of the aluminum alloy rear door panel 1, arc transition structures 23 are provided at both the left and right corners of the bottom of the aluminum alloy rear door panel 1. The arc transition structures 23 can effectively disperse the stress concentration at the corners. Each arc transition structure 23 is fitted with a bottom edge connecting arc plate 8 on its outer side, and the bottom edge connecting arc plate 8 is fixedly connected to the arc transition structure 23 by welding. Specifically, one end of the bottom edge connecting arc plate 8 on the left side is welded to the web plate 18 of the corresponding left rear door beam 2, and the other end is welded to one end of the web plate 18 of the lower rear door beam 3. One end of the bottom edge connecting arc plate 8 on the right side is welded to the web plate 18 of the corresponding right rear door beam 4. One end is fixed to the other end of the web plate 18 of the lower crossbeam 3 of the rear door. Through the connection of the bottom edge connecting arc plate 8, the left side beam 2, the right side beam 4 of the rear door and the web plate 18 of the lower crossbeam 3 of the rear door form a continuous force transmission path. At the same time, the flange plate 19 of the left side beam 2 of the rear door and the flange plate 19 of the lower crossbeam 3 of the rear door are welded together, and the flange plate 19 of the right side beam 4 of the rear door and the flange plate 19 of the lower crossbeam 3 of the rear door are also welded together. The bottom corner plate 9 of the rear door cooperates with the bottom edge connecting arc plate 8 to realize the connection between the frame from the two dimensions of flange plate 19 and web plate 18, which further improves the overall structural strength of the bottom of the rear door.

[0026] like Figure 2 As shown, the corrugated reinforcing liner 7, as an internal reinforcing component of the aluminum alloy rear door panel 1, has an overall plate-like structure. Its two side edges are designed as flat sections, facilitating precise alignment with the frame components. Several triangular protrusions 24 are spaced along the length of the center. The two sides of each triangular protrusion 24 are perpendicular to each other, and the protrusion direction of the triangular protrusions 24 is away from the direction of the aluminum alloy rear door panel 1. This structural design creates a hollow cavity between the triangular protrusions 24 and the aluminum alloy rear door panel 1. This hollow cavity not only reduces the overall weight but also effectively disperses the external forces borne by the aluminum alloy rear door panel 1 through the stability of the triangular structure, significantly improving the overall deformation resistance of the aluminum alloy rear door panel 1. Figure 6-7 As shown, in terms of connection method, the left edge of the corrugated reinforcing liner 7 is welded and fixed to the inner convex rib 21 of the left beam 2 of the rear door, the right edge is welded and fixed to the inner convex rib 21 of the right beam 4 of the rear door, the bottom edge is welded and fixed to the inner convex rib 21 of the lower crossbeam 3 of the rear door, and the bottom corner is welded and fixed to the bottom edge connecting arc plate 8. Through multi-position welding and fixing, the corrugated reinforcing liner 7 can evenly transfer its own supporting force to the frame structure of the rear door, avoiding the deformation problem caused by the lack of support due to local stress on the aluminum alloy rear door panel 1.

[0027] like Figure 4As shown, to strengthen the structure of the upper crossbeam 5 of the rear door, a top reinforcing beam 17 is welded to the top of the upper crossbeam 5 of the rear door. The top reinforcing beam 17 adopts a right-angle folded plate structure, with its corner facing away from the upper crossbeam 5 of the rear door. This structural design gives the top reinforcing beam 17 strong resistance to bending and torsion. The bottom two sides of the top reinforcing beam 17 are fixed to the top of the upper crossbeam 5 of the rear door by welding. When the top of the rear door is subjected to material impact or pressure during transportation, the top reinforcing beam 17 can more efficiently distribute the force to the overall structure of the upper crossbeam 5 of the rear door, avoiding local stress concentration and deformation or cracking of the upper crossbeam 5 of the rear door.

[0028] Two vertically arranged rear door longitudinal beams 6 are welded to the outer side of the aluminum alloy rear door panel 1. The two rear door longitudinal beams 6 are symmetrically distributed about the longitudinal center plane of the aluminum alloy rear door panel 1. The symmetrical distribution design can ensure that the stress on the outer side of the aluminum alloy rear door panel 1 is uniform. The top of each rear door longitudinal beam 6 is welded and fixed to the upper rear door crossbeam 5, and the bottom is welded and fixed to the lower rear door crossbeam 3. The rear door longitudinal beams 6 connect the upper rear door crossbeam 5 and the lower rear door crossbeam 3 longitudinally through the welding at the top and bottom ends, forming a longitudinal support frame, which further improves the overall longitudinal deformation resistance of the rear door.

[0029] like Figure 3 As shown, a special support plate structure is also provided between the rear door longitudinal beam 6 and the frame to strengthen local support. An inclined intermediate support plate 16 is provided between the two rear door longitudinal beams 6. The top edge of the intermediate support plate 16 is welded and fixed to the outer side of the aluminum alloy rear door panel 1, and the bottom edge is welded and fixed to the lower rear door crossbeam 3. The intermediate support plate 16 can transfer the force from the lower part of the aluminum alloy rear door panel 1 to the lower rear door crossbeam 3. At the same time, an inclined side support plate 15 is provided on the side of each rear door longitudinal beam 6 away from the intermediate support plate 16. The top edge of the side support plate 15 is welded and fixed to the outer side of the aluminum alloy rear door panel 1, and the bottom edge is welded and fixed to the lower rear door crossbeam 3 and the rear door bottom corner plate 9 respectively. The intermediate support plate 16 and the side support plate 15 cooperate with each other to form a stable frame structure together with the rear door longitudinal beams 6 and the frame components, further improving the overall strength of the rear door and ensuring that the rear door can maintain structural stability under long-term heavy load and frequent opening and closing conditions.

[0030] Example 2: Based on the aluminum alloy dump truck rear door provided in Example 1, this example further provides a composite connection structure for the aluminum alloy dump truck rear door. The rear door upper crossbeam 5 is fixedly installed with a rear door flip hinge seat 2 11 near the end of the right side beam 4 of the rear door. The rear door flip hinge seat 2 11 is rotatably installed with a rear door flip hinge shaft 10 through a bushing structure. The outer side of the rear door flip hinge shaft 10 is designed with a matching connection structure, which can be detachably connected to the car body. When disassembling, it can be separated by plugging or unlocking the connecting parts. After assembly, it can stably transmit rotational force. A rear door flip hinge seat 12 is installed at the end of the upper crossbeam 5 of the rear door near the left side beam 2 of the rear door. The rear door flip hinge seat 12 integrates a rear door bidirectional hinge shaft 13. The two ends of the rear door bidirectional hinge shaft 13 are designed vertically, with the upper axis being horizontal and the lower axis being vertical. This bidirectional structure can adapt to rotation requirements in different directions. The rear door flip hinge seat 12 is rotatably connected to the upper end of the rear door bidirectional hinge shaft 13 through a built-in rotating component, allowing it to rotate flexibly around the upper horizontal axis. The lower end of the rear door bidirectional hinge shaft 13 is rotatably engaged with the hinge shaft sleeve 26. The hinge shaft sleeve 26 is installed in a position corresponding to the clearance groove 25 on the left side beam 2 of the rear door. The hinge shaft sleeve 26 can be fixedly connected to the carriage by bolts or welding to ensure a stable support base during the rotation of the rear door. At the same time, a rear door side opening hinge seat 14 is also fixedly installed at the end of the left side beam 2 of the rear door near the lower cross beam 3 of the rear door. The shaft hole position of the rear door side opening hinge seat 14 corresponds precisely to the position of the pre-set hinge shaft on the carriage. The two adopt a plug-in rotating connection structure. After plugging in, the rear door side opening hinge seat 14 can rotate smoothly around the hinge shaft on the carriage. When separating, it can be disconnected by simply pulling it out axially.

[0031] The specific usage method is as follows, which can realize two different opening and closing methods: flipping and side opening and closing. When flipping opening and closing operation is required, firstly, manually or through mechanical structure, separate the rear door side opening hinge seat 14 from the hinge shaft on the carriage to release the rotation constraint between the two. At this time, the rear door flipping hinge seat one 12 and the rear door flipping hinge seat two 11 on the rear door become the main rotation support components. The rear door flipping hinge seat one 12 can rotate around the upper end of the rear door bidirectional hinge shaft 13, while the rear door flipping hinge seat two 11 can rotate synchronously around the rear door flipping hinge shaft 10. Through the coordinated rotation of the two hinge seats, the entire rear door is driven to achieve the flipping opening and closing action. During the flipping opening and closing process, since the upper part of the left side beam 2 of the rear door is pre-set with a clearance groove 25, the clearance groove 25 provides sufficient movement space for the hinge shaft sleeve 26, so that the hinge shaft sleeve 26 will not contact the left side beam 2 of the rear door or other components when the rear door rotates, effectively avoiding interference problems and ensuring smooth and unhindered flipping action. When a side opening / closing operation is required, the operation steps differ from those for flip opening / closing. First, the rear door flip hinge shaft 10 on the rear door flip hinge seat 21 must be separated from the carriage to release the connection constraint at this part. At this time, the rotation support of the rear door is jointly borne by the hinge shaft sleeve 26 and the rear door side opening hinge seat 14. The hinge shaft sleeve 26 on the rear door can rotate around the lower end of the rear door bidirectional hinge shaft 13, while the rear door side opening hinge seat 14 can rotate around the hinge shaft on the carriage. Through the coordinated rotation of these two components, the rear door can achieve the side opening / closing action. Similarly, during the side opening / closing process, due to the existence of the clearance groove 25, the hinge shaft sleeve 26 is always within the clearance range of the clearance groove 25 during the rotation process, and will not interfere with other structures of the rear door, ensuring that the side opening / closing action is stable and reliable.

[0032] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: In this specific embodiment, on the one hand, the strength of the rear door is enhanced by multiple structures: the left side beam, the right side beam, and the lower crossbeam of the rear door are respectively assembled on the left, right, and bottom of the aluminum alloy rear door panel. All three contain mutually perpendicular web plates and flange plates. The web plate has integrally formed outward and inward convex ribs. The height of the outward convex rib is higher than that of the inward convex rib, which can improve the structural strength and protect the aluminum alloy rear door panel. The outward and inward convex ribs form a U-shaped groove, which is embedded in the edge of the aluminum alloy rear door panel and then welded and fixed. Insertion before welding improves the connection strength. At the same time, a corrugated reinforcing liner is welded to the inner side of the aluminum alloy rear door panel. The two form a honeycomb support structure, which enhances the strength without significantly increasing the weight of the aluminum alloy rear door panel. On the other hand, it achieves bidirectional opening and closing of the rear door: during tilting and opening, the rear door side-opening hinge seat separates from the hinge shaft on the truck body, and rear door tilting hinge seat one and rear door tilting hinge seat two rotate around the rear door bidirectional hinge shaft and the rear door tilting hinge shaft, respectively; during side opening and closing, the rear door tilting hinge shaft on rear door tilting hinge seat two separates from the truck body, and the hinge shaft sleeve and rear door side-opening hinge seat rotate around the rear door bidirectional hinge shaft and the hinge shaft on the truck body, respectively. In summary, the aluminum alloy dump truck rear door and its composite connection structure enhance the strength of the aluminum alloy rear door panel and control its weight through the aluminum alloy material and honeycomb support structure, while simultaneously achieving bidirectional opening of the dump truck rear door.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rear door for an aluminum alloy dump truck, characterized in that, The rear door panel (1) is made of aluminum alloy. The left side, right side and bottom of the aluminum alloy rear door panel (1) are respectively equipped with a left rear door beam (2), a right rear door beam (4) and a lower rear door crossbeam (3). The left rear door beam (2), the right rear door beam (4) and the lower rear door crossbeam (3) all include mutually perpendicular web plates (18) and flange plates (19). The web plate (18) is provided with an integrally formed outward convex rib (20) and an inward convex rib (21). The height of the outward convex rib (20) is higher than that of the inward convex rib (21). The outward convex rib (20) and the inward convex rib (21) are perpendicular to each other. U-shaped grooves (22) are formed between the ribs (21). The left edge, right edge and bottom edge of the aluminum alloy rear door panel (1) are respectively embedded in the U-shaped grooves (22) of the left beam (2), right beam (4) and lower crossbeam (3) of the rear door, and fixed by welding. The upper crossbeam (5) of the rear door is welded to the top outer side of the aluminum alloy rear door panel (1), and the corrugated reinforcing liner (7) is welded to the inner side of the aluminum alloy rear door panel (1). A honeycomb support structure is formed between the corrugated reinforcing liner (7) and the aluminum alloy rear door panel (1).

2. The aluminum alloy dump truck rear door according to claim 1, characterized in that, A rounded transition structure (23) is provided at the left and right corners of the bottom of the aluminum alloy rear door panel (1). Each rounded transition structure (23) is fitted with a bottom edge connecting arc plate (8) on the outside. The bottom edge connecting arc plate (8) is welded and fixed to the rounded transition structure (23). One end of the bottom edge connecting arc plate (8) is welded and fixed to the web plate (18) of the corresponding left rear door beam (2) or the web plate (18) of the right rear door beam (4). The other end is welded and fixed to the web plate (18) of the lower rear door beam (3). The flange plate (19) of the left rear door beam (2) or the flange plate (19) of the right rear door beam (4) is welded to the flange plate (19) of the lower rear door beam (3). The bottom corner plate (9) of the rear door is welded between the flange plate (19) of the left rear door beam (2) or the flange plate (19) of the right rear door beam (4) and the flange plate (19) of the lower rear door beam (3).

3. The aluminum alloy dump truck rear door according to claim 2, characterized in that, The corrugated reinforcing liner (7) is a plate structure with two flat edges. Several triangular protrusions (24) are spaced along the length of the middle part. The two sides of the triangular protrusions (24) are perpendicular to each other, and the protrusion direction is away from the aluminum alloy rear door panel (1). A hollow cavity is formed between the triangular protrusions (24) and the aluminum alloy rear door panel (1).

4. The aluminum alloy dump truck rear door according to claim 3, characterized in that, The left edge of the corrugated reinforcing liner (7) is welded and fixed to the inner convex rib (21) of the left beam (2) of the rear door, the right edge is welded and fixed to the inner convex rib (21) of the right beam (4) of the rear door, the bottom edge is welded and fixed to the inner convex rib (21) of the lower crossbeam (3) of the rear door, and the bottom corner is welded and fixed to the bottom edge connecting arc plate (8).

5. The aluminum alloy dump truck rear door according to claim 1, characterized in that, A top reinforcing beam (17) is welded to the top of the upper crossbeam (5) of the rear door.

6. The aluminum alloy dump truck rear door according to claim 5, characterized in that, The top reinforcing beam (17) is a right-angle folded plate structure, with its corner facing away from the upper crossbeam (5) of the rear door. The bottom two sides of the top reinforcing beam (17) are welded and fixed to the top of the upper crossbeam (5) of the rear door.

7. The aluminum alloy dump truck rear door according to claim 2, characterized in that, Two vertically arranged rear door longitudinal beams (6) are welded to the outer side of the aluminum alloy rear door panel (1). The two rear door longitudinal beams (6) are symmetrically distributed about the longitudinal center plane of the aluminum alloy rear door panel (1). The top of each rear door longitudinal beam (6) is welded and fixed to the upper rear door crossbeam (5), and the bottom is welded and fixed to the lower rear door crossbeam (3).

8. The aluminum alloy dump truck rear door according to claim 7, characterized in that, An inclined intermediate support plate (16) is provided between the two rear door longitudinal beams (6). The top edge of the intermediate support plate (16) is welded and fixed to the outer side of the aluminum alloy rear door panel (1), and the bottom edge is welded and fixed to the rear door lower crossbeam (3). An inclined side support plate (15) is provided on the side of each rear door longitudinal beam (6) away from the intermediate support plate (16). The top edge of the side support plate (15) is welded and fixed to the outer side of the aluminum alloy rear door panel (1), and the bottom edge is welded and fixed to the rear door lower crossbeam (3) and the rear door bottom corner plate (9) respectively.

9. The aluminum alloy dump truck rear door according to claim 1, characterized in that, An anti-airway groove (25) is provided on the upper part of the left side beam (2) of the rear door. The anti-airway groove (25) is located on the side of the left side beam (2) of the rear door away from the aluminum alloy rear door panel (1).

10. A composite connection structure for the rear door of an aluminum alloy dump truck, characterized in that, The rear door of the aluminum alloy dump truck as described in any one of claims 1-9 is provided with a rear door flip hinge seat 2 (11) installed at the end of the upper crossbeam (5) of the rear door near the right side beam (4) of the rear door. The rear door flip hinge seat 2 (11) is rotatably installed with a rear door flip hinge shaft (10). The rear door flip hinge seat 1 (12) is installed at the end of the upper crossbeam (5) of the rear door near the left side beam (2) of the rear door. The rear door flip hinge seat 1 (12) is rotatably connected to one end of the rear door bidirectional hinge shaft (13). The other end of the rear door bidirectional hinge shaft (13) is rotatably connected to the hinge shaft sleeve (26). The hinge shaft sleeve (26) can be fixedly connected to the truck body. The rear door side opening hinge seat (14) is installed at the end of the left side beam (2) of the rear door near the lower crossbeam (3) of the rear door.

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