Frame structure of variable cross-section high-load special vehicle and special vehicle

Abstract

The invention discloses a frame structure of a variable cross-section high-load special vehicle and the special vehicle, and belongs to the technical field of special vehicle chassis, the frame structure comprises a first longitudinal beam and a second longitudinal beam which adopt a plurality of sections of stepped structures with different cross section forms, and the first longitudinal beam and the second longitudinal beam are symmetrically arranged; a comprehensive reinforcing cross beam and a plurality of cross beams are arranged between the first longitudinal beam and the second longitudinal beam; the first longitudinal beam and the second longitudinal beam in the middle of the frame are provided with a first upper-mounted combined support, and one side of the first longitudinal beam in the middle of the frame is provided with a second upper-mounted combined support; a supporting rotary disc flange with a hole formed in the middle is arranged above a first longitudinal beam and a second longitudinal beam at the tail of the frame, and a walking board structure is arranged on the peripheral side of the supporting rotary disc flange. The frame structure of the high-load special vehicle is light in weight, modularized and convenient to maintain, the loading capacity and stability between frames are improved by optimizing the cross section of the longitudinal beam, designing the modularized support and reducing the weight of the structure, and the problems that a traditional frame is large in weight, poor in stability, complex in installation and the like are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of special vehicle chassis, and particularly relates to a frame structure and a special vehicle of a special vehicle with variable cross-section and high load capacity. Background Art

[0002] At present, traditional heavy-duty vehicles with high load-bearing capacity generally adopt a non-load-bearing body, and the frame structure is generally composed of "C"-type longitudinal beams and channel steel cross beams. Heavy special vehicles have the characteristics of large load-bearing mass and high stability requirements. Therefore, in the design of traditional heavy special vehicles, a non-load-bearing body is usually adopted, and the frame, as the core load-bearing structure of the whole vehicle, is mainly composed of longitudinal beam structures such as "C"-type, "Z"-type, and "C+Z"-type and channel steel cross beams through riveting or welding. However, with the increasing demand for vehicle load capacity, stability, and versatility in special operation scenarios, the traditional frame structure gradually exposes the following problems:

[0003] First, it is heavy and has low space utilization rate. The traditional longitudinal beam adopts a single cross-section form. To meet the high load-bearing requirements, it is necessary to increase the material thickness or add additional support structures, resulting in a bulky frame that occupies a large space. For example, to support the upper-mounted equipment with a high centroid and large volume, a large number of auxiliary brackets need to be welded in the middle or at the tail of the frame, further increasing the weight and assembly complexity.

[0004] Second, the stability is insufficient. Under steering or bumpy conditions, due to the action of inertial forces, the upper-mounted equipment on the traditional frame is prone to shift or even overturn, and additional reinforcement measures (such as limit blocks or cables) need to be set up, but such designs increase the manufacturing cost and installation difficulty.

[0005] Third, redundant design leads to low efficiency. Cross beams are usually set at the front end of the frame to enhance the structural strength, but the engine and transmission itself already have a supporting function. The redundant cross beams not only increase the weight but also hinder the installation and maintenance of components such as sensors and wiring harnesses.

[0006] Fourth, the maintainability and expandability are poor. The traditional frame tail lacks modular design, and customized welding brackets are required for equipment installation, resulting in difficult maintenance and inability to quickly replace equipment. In addition, there is a lack of a dedicated inspection channel, and workers need to climb onto the roof or use external tools, posing a safety hazard. Summary of the Invention

[0007] Aiming at the problems existing in the prior art, the present invention provides a frame structure and a special vehicle of a special vehicle with variable cross-section and high load capacity, which is a frame structure of a high load-bearing special vehicle that realizes lightweight, modularization, and convenient maintenance. By optimizing the longitudinal beam cross-section, modular bracket design, and structural weight reduction scheme, it can improve the load-bearing capacity and stability of the vehicle, solve the problems of the traditional frame being heavy, having poor stability, and being complex to install, and enhance the maintenance convenience and equipment compatibility.

[0008] The technical solution of the present invention is as follows:

[0009] In the first aspect of the present invention, a frame structure of a special vehicle with variable cross-section and high load capacity is provided, including a first longitudinal beam and a second longitudinal beam adopting a stepped structure with multiple different cross-section forms. The first longitudinal beam and the second longitudinal beam are symmetrically arranged, and an integrated strengthening cross beam and multiple cross beams are provided between the first longitudinal beam and the second longitudinal beam; a first upper mounting combined bracket is provided on the first longitudinal beam and the second longitudinal beam in the middle of the frame, and a second upper mounting combined bracket is provided on one side of the first longitudinal beam in the middle of the frame; a support turntable flange with a hole in the middle is provided above the first longitudinal beam and the second longitudinal beam at the tail of the frame, and a platform plate structure is provided on the periphery of the support turntable flange.

[0010] In some embodiments of the present invention, the multiple cross beams include a head cross beam and a tail cross beam. The head cross beam is arranged between the first longitudinal beam and the second longitudinal beam at the head of the frame, the tail cross beam is arranged between the first longitudinal beam and the second longitudinal beam at the tail of the frame, and the integrated strengthening cross beam is arranged between the first longitudinal beam and the second longitudinal beam in the middle of the frame and is connected to the support turntable flange.

[0011] In some embodiments of the present invention, a thrust rod support is integrally welded to the bottom of the integrated strengthening cross beam;

[0012] The integrated strengthening cross beam includes a bottom plate, a dovetail upper cover plate, two I-shaped strengthening vertical plates, and two diagonal tension strengthening rib plates. Two I-shaped strengthening vertical plates are symmetrically arranged on the bottom plate at a certain distance interval. The dovetail upper cover plate is provided on the two I-shaped strengthening vertical plates, and both ends of the dovetail upper cover plate are respectively connected to the first longitudinal beam and the second longitudinal beam;

[0013] Multiple through holes are provided on both of the two diagonal tension strengthening rib plates; the two diagonal tension strengthening rib plates are arranged between the two I-shaped strengthening vertical plates, and the upper and lower ends of the two diagonal tension strengthening rib plates are respectively connected to the dovetail upper cover plate and the bottom plate. The interval distance between the upper ends of the two diagonal tension strengthening rib plates is less than the interval distance between the lower ends of the two diagonal tension strengthening rib plates.

[0014] In some embodiments of the present invention, the first longitudinal beam and the second longitudinal beam are arranged in a stepped structure with three-section heights. The heights of the first longitudinal beam and the second longitudinal beam in the head section of the frame are less than the heights of the first longitudinal beam and the second longitudinal beam in the middle section of the frame, and the heights of the first longitudinal beam and the second longitudinal beam in the middle section of the frame are less than the heights of the first longitudinal beam and the second longitudinal beam in the tail section of the frame.

[0015] In some embodiments of the present invention, the first upper mounting combined bracket is provided on the upper parts of the first longitudinal beam and the second longitudinal beam in the middle section of the frame, the second upper mounting combined bracket is provided on one side of the first longitudinal beam in the middle section of the frame, and the support turntable flange is provided on the upper parts of the first longitudinal beam and the second longitudinal beam in the tail section of the frame.

[0016] In some embodiments of the present invention, a plurality of limiting structures are provided on the first longitudinal beam and the second longitudinal beam of the middle section of the vehicle frame, and the plurality of limiting structures form a constraint area to limit the upper-mounted equipment; the limiting structure includes a limiting seat bottom plate, and a limiting seat is provided on the limiting seat bottom plate.

[0017] In some embodiments of the present invention, the first upper-mounted combined bracket is arranged in a rectangular frame structure, a pull-out ladder is provided on the first upper-mounted combined bracket, and a plurality of fixed suspension locks are further provided at the four corner positions of the first upper-mounted combined bracket.

[0018] In some embodiments of the present invention, the second upper-mounted combined bracket includes a first external hanging support bracket, two second external hanging support brackets and a strengthening fixing plate. One end of the first external hanging support bracket and the two second external hanging support brackets is connected to the first longitudinal beam, and the other end of the first external hanging support bracket and the two second external hanging support brackets is connected to the strengthening fixing plate; the strengthening fixing plate is arranged outward and away from the first longitudinal beam, and the height of the strengthening fixing plate is higher than that of the first longitudinal beam.

[0019] In some embodiments of the present invention, the platform plate structure includes a platform plate skeleton weldment arranged in a portal frame structure. The platform plate skeleton weldment is arranged on the upper parts of the first longitudinal beam and the second longitudinal beam at the tail of the vehicle frame. A plurality of platform plates are provided on the upper part of the platform plate skeleton weldment, and a plurality of mudguards are respectively provided on both sides of the lower part of the platform plate skeleton weldment; a support turntable flange is provided in the middle of the platform plate, and a plurality of hanging rings and hooks are provided on both sides of the platform plate.

[0020] In the second aspect of the present invention, a special vehicle is provided, which adopts the vehicle frame structure of a variable cross-section high-load special vehicle as described in any one of the above.

[0021] One or more technical solutions of the present invention have the following beneficial effects:

[0022] Through the collaborative innovation in four aspects of lightweight design, stability enhancement, maintenance convenience optimization, and cost control of the special vehicle frame, the present invention systematically designs a closed-loop innovation idea of "weight reduction - reinforcement - stability - convenience", and finally realizes the comprehensive technical goals of high load, high stability, easy maintenance, and low cost required by the special vehicle frame structure, among which:

[0023] First, the balance between lightweight and high strength of the vehicle frame structure is achieved;

[0024] By changing the cross-section of different sections of the longitudinal beam, the structure is strengthened in key stress-bearing areas and material redundancy is reduced in non-stress-bearing areas, thereby reducing the overall weight and improving the bending strength of the longitudinal beam; a hole is opened in the middle of the tail turntable flange to reduce weight, and the annular structure is combined with a comprehensive reinforced crossbeam to ensure that the supporting strength is not reduced and to provide a stable base for the walkway; the rigid connection between the engine and the gearbox is used to replace the crossbeam set at the front end of the traditional frame, reducing the redundant weight of the traditional frame.

[0025] The lightweight design covers the front, middle and rear sections of the frame. The overall weight is reduced by setting variable-section longitudinal beams, digging holes in the support turntable flange to reduce weight, and omitting the crossbeam at the front end of the frame. At the same time, local reinforcement, such as setting diagonal stiffeners and using integrated welding of multiple structures, compensates for the strength requirements after weight reduction, achieving weight reduction without reducing quality.

[0026] Second, the stability and functional expandability of the frame are improved;

[0027] The thrust rod support and the integrated reinforced crossbeam are welded as a whole, supplemented by the setting of diagonal reinforcement ribs to improve the lateral bearing capacity and reduce the influence of the inertia force of the vehicle when turning on the equipment; a number of limit seats are set in the middle of the frame to form a constraint area, which plays a limiting role for the upper equipment, combined with the three-point fixing method of the external bracket (avoiding the steering rod) and the reinforced fixing plate, the equipment offset is reduced and the supporting stability of the frame is significantly improved; the first upper mounting combination bracket and the second upper mounting combination bracket are connected by bolts to support quick disassembly and assembly; the walkway is integrated with the ladder hanging structure, and the hooks and tarpaulin fixing points expand the operating functions of the frame, which is convenient for staff to quickly get on the vehicle and place the tarpaulin, thereby improving personnel work efficiency.

[0028] Third, maintenance convenience and assembly efficiency optimization;

[0029] A supporting turntable flange with a hole in the middle is set at the rear of the frame to facilitate the upper equipment and installation staff to repair the equipment; a detachable walkway structure is installed, and the walkway floor plank is welded to the walkway frame and fixed by bolts, which is convenient for the removal of the floor plank and shortens the time for vehicle maintenance; a pull-out ladder is set and welded to the frame of the first upper assembly bracket to facilitate the staff to operate and repair the equipment; after the front end crossbeam of the frame is removed, the installation space of sensors, wiring harnesses and other components is increased. The maintenance optimization measures cover the front, middle and rear sections of the frame, and the above measures are combined to improve the comprehensive maintenance efficiency of the frame.

[0030] Fourth, cost control and process simplification;

[0031] By simplifying the structure, such as reducing redundant parts, and optimizing the process, such as integrating the welding of reinforced crossbeams and thrust rod supports, the manufacturing cost can be reduced while improving production consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the frame structure of a special vehicle with variable cross-section and high load capacity provided in Embodiment 1 of the present invention;

[0033] Figure 2 This is a top view schematic diagram of the overall structure of the frame structure of a special vehicle with variable cross-section and high load capacity provided in Embodiment 1 of the present invention;

[0034] Figure 3 This is a combined structure schematic diagram of the first longitudinal beam, the second longitudinal beam, the support turntable flange and the comprehensive strengthening cross beam provided in Embodiment 1 of the present invention;

[0035] Figure 4 This is an external structure schematic diagram of the comprehensive strengthening cross beam provided in Embodiment 1 of the present invention;

[0036] Figure 5 This is an internal structure schematic diagram of the comprehensive strengthening cross beam provided in Embodiment 1 of the present invention;

[0037] Figure 6 This is a structure schematic diagram of the first upper mounting combined bracket provided in Embodiment 1 of the present invention;

[0038] Figure 7 This is a structure schematic diagram of the second upper mounting combined bracket provided in Embodiment 1 of the present invention;

[0039] Figure 8 This is a structure schematic diagram of the limit seat provided in Embodiment 1 of the present invention;

[0040] Figure 9 This is a structure schematic diagram of the welded walkway plate skeleton provided in Embodiment 1 of the present invention;

[0041] Figure 10 This is a structure schematic diagram of the hanging ring provided in Embodiment 1 of the present invention;

[0042] Figure 11 This is a structure schematic diagram of the hook provided in Embodiment 1 of the present invention.

[0043] In the figure: 1. Frame body; 2. First longitudinal beam; 3. Second longitudinal beam; 4. Support turntable flange; 5. Comprehensive strengthening cross beam; 6. Thrust rod support; 7. Swallowtail upper cover plate; 8. Strengthening vertical plate; 9. Diagonal tension strengthening rib plate; 10. First upper mounting combined bracket; 11. Drawer-type ladder; 12. Fixed suspension lock; 13. Second upper mounting combined bracket; 14. First external hanging support bracket; 15. Second external hanging support bracket; 16. Strengthening fixing plate; 17. Limit seat; 18. Limit seat bottom plate; 19. Welded walkway plate skeleton; 20. Walkway plate flooring; 21. Hanging ring; 22. Hook; 23. Tail cross beam; 24. Upper connecting plate; 25. Lower connecting plate; 26. Fender. Detailed implementation manners

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] Embodiment 1

[0046] In a typical implementation manner of the present invention, a frame structure of a special vehicle with variable cross-sections and high load capacity is proposed, including a first longitudinal beam 2 and a second longitudinal beam 3 with a stepped structure of multiple different cross-section forms. The first longitudinal beam 2 and the second longitudinal beam 3 are symmetrically arranged, and a comprehensive strengthening cross beam 5 and multiple cross beams are provided between the first longitudinal beam 2 and the second longitudinal beam 3; a first upper mounting combined bracket 10 is provided on the first longitudinal beam 2 and the second longitudinal beam 3 in the middle of the frame, and a second upper mounting combined bracket 13 is provided on one side of the first longitudinal beam 2 in the middle of the frame; a support turntable flange 4 with a central hole is provided above the first longitudinal beam 2 and the second longitudinal beam 3 at the tail of the frame, and a platform plate structure is provided on the periphery of the support turntable flange 4.

[0047] In this embodiment, the head section of the frame body 1 structure is mainly composed of a first longitudinal beam 2, a second longitudinal beam 3, upper and lower connecting plates 25 and cross beams connected by bolts or rivets. The tail section of the frame body 1 structure is mainly composed of the first longitudinal beam 2, the second longitudinal beam 3 and cross beams integrally welded. Upper connecting plates 24 are provided on the upper parts of the first longitudinal beam 2 and the second longitudinal beam 3. The upper connecting plates 24 increase the connection area between the first longitudinal beam 2 and the second longitudinal beam 3, and various connection structures can be provided on the upper connecting plates 24, which is convenient for connecting with other structures provided on the upper parts of the first longitudinal beam 2 and the second longitudinal beam 3. Similarly, lower connecting plates 25 are provided on the lower parts of the first longitudinal beam 2 and the second longitudinal beam 3 for connecting the lower structures of the frame.

[0048] By changing the cross-sections of different sections of the longitudinal beam, the structure is strengthened in the key stress areas, and the material redundancy is reduced in the non-stress areas. While reducing the overall weight, the bending strength of the longitudinal beam is improved; the central hole in the tail turntable flange realizes weight reduction, and the annular structure cooperates with the comprehensive strengthening cross beam 5 to ensure that the support strength is not reduced, and provides a stable base for the platform plate structure.

[0049] The lightweight design covers the front, middle and rear sections of the frame. Through the combined design of setting variable cross-section stepped longitudinal beams, boring holes in the support turntable flange 4 for weight reduction and omitting the cross beam at the front end of the frame, the overall weight of the frame is reduced. At the same time, through local strengthening, such as setting the comprehensive strengthening cross beam 5 and using integral welding for multiple structures to make up for the strength requirements after weight reduction, the weight reduction without sacrificing quality is achieved.

[0050] Further, the multiple cross beams include a head cross beam and a tail cross beam 23. The head cross beam is disposed between the first longitudinal beam 2 and the second longitudinal beam 3 at the head of the vehicle frame. The tail cross beam 23 is disposed between the first longitudinal beam 2 and the second longitudinal beam 3 at the tail of the vehicle frame. The comprehensive reinforcing cross beam 5 is disposed between the first longitudinal beam 2 and the second longitudinal beam 3 in the middle of the vehicle frame and is connected to the support turntable flange 4.

[0051] Between the first longitudinal beam 2 and the second longitudinal beam 3 at the head section of the vehicle frame, except for cross beams provided at the ends of the first longitudinal beam 2 and the second longitudinal beam 3, no other cross beams are provided. By arranging structures such as an engine and a reduction gearbox here, the rigid connection of the engine and the gearbox to the first longitudinal beam 2 and the second longitudinal beam 3 is used to replace multiple cross beams provided at the front end of the traditional vehicle frame, reducing the redundant weight of the traditional vehicle frame while ensuring the supportability and stability of the vehicle frame, and facilitating the disassembly and assembly of sensing components.

[0052] A process hole is opened at the center of the tail cross beam 23, and a sealing plate is added and connected thereto by bolts, facilitating vehicle maintenance.

[0053] Further, a thrust rod support 6 is integrally welded to the bottom of the comprehensive reinforcing cross beam 5;

[0054] The comprehensive reinforcing cross beam 5 includes a bottom plate, a dovetail upper cover plate 7, two I-shaped reinforcing vertical plates 8, and two diagonal reinforcing rib plates 9. Two I-shaped reinforcing vertical plates 8 are symmetrically provided on the bottom plate at a certain interval. The dovetail upper cover plate 7 is provided on the two I-shaped reinforcing vertical plates 8. The two ends of the dovetail upper cover plate 7 are respectively connected to the first longitudinal beam 2 and the second longitudinal beam 3;

[0055] A plurality of through holes are provided on each of the two diagonal reinforcing rib plates 9; the two diagonal reinforcing rib plates 9 are disposed between the two I-shaped reinforcing vertical plates 8. The upper and lower ends of the two diagonal reinforcing rib plates 9 are respectively connected to the dovetail upper cover plate 7 and the bottom plate. The interval distance between the upper ends of the two diagonal reinforcing rib plates 9 is less than the interval distance between the lower ends of the two diagonal reinforcing rib plates 9.

[0056] In this embodiment, the thrust rod support 6 and the comprehensive reinforcing cross beam 5 are integrally welded into a whole, improving the stability and functional expandability of the vehicle frame. With the setting of diagonal reinforcing ribs, the lateral bearing capacity is improved, and the influence of inertial force during vehicle turning on the equipment is reduced.

[0057] The upper cover plate of the comprehensive reinforcing cross beam 5 adopts a dovetail structure, thereby increasing the welding area with the left and right first longitudinal beam 2 and the second longitudinal beam 3 of the vehicle frame, and improving the strength of the cross beam on the side; the comprehensive reinforcing cross beam 5 and the thrust rod support 6 are welded and connected, saving the layout of pipelines and lines at the cross beam position. And because the thrust rod support 6 is subjected to a large lateral pulling force, diagonal reinforcing ribs are added on both sides of the cross beam, thereby improving the strength of the thrust rod support 6 and the box-shaped cross beam.

[0058] Furthermore, the first longitudinal beam 2 and the second longitudinal beam 3 are arranged in a stepped structure with three-section heights. The heights of the first longitudinal beam 2 and the second longitudinal beam 3 in the head section of the vehicle frame are less than those of the first longitudinal beam 2 and the second longitudinal beam 3 in the middle section of the vehicle frame, and the heights of the first longitudinal beam 2 and the second longitudinal beam 3 in the middle section of the vehicle frame are less than those of the first longitudinal beam 2 and the second longitudinal beam 3 in the tail section of the vehicle frame.

[0059] Since the traditional longitudinal beam adopts a single cross-section form, to meet the high load requirements, it is necessary to increase the material thickness or add additional support structures, resulting in a bulky vehicle frame that occupies a large space. For example, to support the upper equipment with a high center of mass and large volume, a large number of auxiliary brackets need to be welded in the middle or tail of the vehicle frame, further increasing the weight and assembly complexity.

[0060] In this embodiment, the first longitudinal beam 2 and the second longitudinal beam 3 of the vehicle frame are arranged in a stepped structure with three-section heights to adapt to the overall vehicle layout structure, improve the strength of the longitudinal beam of the vehicle frame, reduce the problem of excessive weight of the vehicle frame caused by the need to set a large number of brackets on the traditional vehicle frame for the installation of other equipment, save the vehicle bottom space while reducing the overall vehicle weight, and effectively solve the problems of bulkiness and large space occupation of the traditional vehicle frame.

[0061] Furthermore, the first upper mounting combined bracket 10 is arranged on the upper parts of the first longitudinal beam 2 and the second longitudinal beam 3 in the middle section of the vehicle frame, the second upper mounting combined bracket 13 is arranged on one side of the first longitudinal beam 2 in the middle section of the vehicle frame, and the support turntable flange 4 is arranged on the upper parts of the first longitudinal beam 2 and the second longitudinal beam 3 in the tail section of the vehicle frame.

[0062] In this embodiment, as Figure 2 shown, the first upper mounting combined bracket 10 is arranged in the middle of the vehicle frame, with a limiting structure and the second upper mounting combined bracket 13 on its left side, and a walkway plate structure and the support turntable flange 4 on its right side.

[0063] Furthermore, a plurality of limiting structures are arranged on the first longitudinal beam 2 and the second longitudinal beam 3 in the middle section of the vehicle frame, and the plurality of limiting structures form a constraint area to limit the upper equipment; the limiting structure includes a limiting seat bottom plate 18, and a limiting seat 17 is arranged on the limiting seat bottom plate 18.

[0064] A plurality of limiting seats 17 are arranged in the middle of the vehicle frame to form a constraint area, which plays a role in limiting the upper equipment. Combined with the three-point fixing method (avoiding the steering tie rod) of the external hanging bracket and the strengthening fixing plate 16, the equipment offset amount is reduced, and the support stability of the vehicle frame is significantly improved.

[0065] Further, the first upper mounting combined bracket 10 is arranged in a rectangular frame structure. A pull-out ladder 11 is provided on the first upper mounting combined bracket 10. A plurality of fixed suspension locks 12 are also provided at the four corner positions of the first upper mounting combined bracket 10. The length direction of the first upper mounting combined bracket 10 is perpendicular to the length directions of the first longitudinal beam 2 and the second longitudinal beam 3, and the length dimension of the first upper mounting combined bracket 10 is the same as the length dimension of the walking platform floor board 20.

[0066] In this embodiment, the first upper mounting combined bracket 10 is bolted to the vehicle frame. Its pull-out ladder 11 is welded to the skeleton of the first upper mounting combined bracket 10, which is convenient for the staff to operate, disassemble and repair the equipment. And 4 fixed suspension locks 12 are arranged diagonally on the plane of the first upper mounting combined bracket 10, which is beneficial to the installation and disassembly of the upper mounting equipment.

[0067] Further, the second upper mounting combined bracket 13 includes a first external hanging support bracket 14, two second external hanging support brackets 15 and a strengthening fixed plate 16. One ends of the first external hanging support bracket 14 and the two second external hanging support brackets 15 are connected to the first longitudinal beam 2, and the other ends of the first external hanging support bracket 14 and the two second external hanging support brackets 15 are connected to the strengthening fixed plate 16; the strengthening fixed plate 16 is arranged outward away from the first longitudinal beam 2, and the height of the strengthening fixed plate 16 is higher than that of the first longitudinal beam 2.

[0068] In this embodiment, the second upper mounting combined bracket 13 is bolted to the vehicle frame. And due to avoiding the steering tie rod and the over-large volume of the upper mounting equipment, the first external hanging support bracket 14 and the two second external hanging support brackets 15 adopt a three-point fixing method with the first longitudinal beam 2 of the vehicle frame. The second upper mounting combined bracket 13 is designed in a bent structure, which does not interfere with the overall vehicle frame layout while reducing weight, and a strengthening fixed plate 16 is welded at the bottom of the bracket to reinforce the skeleton of the bracket again, comprehensively improving the overall stability of the bracket.

[0069] Further, the walking platform structure includes a walking platform skeleton weldment 19 arranged in a portal frame structure. The walking platform skeleton weldment 19 is arranged on the upper parts of the first longitudinal beam 2 and the second longitudinal beam 3 at the tail of the vehicle frame. A plurality of walking platform floor boards 20 are provided on the upper part of the walking platform skeleton weldment 19. A plurality of fenders are respectively provided on both sides of the lower part of the walking platform skeleton weldment 19; a support turntable flange 4 is provided in the middle of the walking platform floor board 20, and a plurality of hanging rings 21 and hooks 22 are provided on both sides of the walking platform floor board 20.

[0070] In this embodiment, the walking platform frame welding 19 is arranged as a portal frame structure. An interval space is provided in the middle of the walking platform frame welding 19 for fitting connection with the first longitudinal beam 2 and the second longitudinal beam 3, providing a frame support for the walking platform structure. Holes are drilled in the walking platform decking 20 for drilling and assembling with the walking platform frame welding 19, thereby reducing the process flow and the assembly error of the decking. The layout of the fender is optimized so that it is fixed to the lower part of the walking platform frame welding 19, reducing the bracket arrangement and lightening the vehicle weight. The walking platform decking 20 and the walking platform frame welding 19 are fixed by bolts, facilitating the disassembly of the decking and vehicle maintenance. A plurality of hanging rings 21 and hooks 22 are provided on both sides of the walking platform decking 20. The walking platform decking 20 is integrated with the ladder hanging structure. The hooks 22 and the tarpaulin fixing points expand the operation function of the vehicle frame, facilitating the staff to quickly get on the vehicle and place the tarpaulin, improving the work efficiency of the staff. At the same time, both the hanging rings 21 and the hooks 22 are provided with bottom plates, and holes are drilled in advance on their bottom plates, facilitating drilling and installation on the vehicle frame, and their structures are simple and easy to manufacture.

[0071] In the second aspect of the present invention, a special vehicle is provided, which adopts the frame structure of a variable cross-section high-load special vehicle as described in any one of the above.

[0072] Through the collaborative innovation in four aspects of lightweight design, stability enhancement, maintenance convenience optimization, and cost control of the special vehicle frame, a systematic design forms a closed-loop innovation idea of "weight reduction - reinforcement - stability - convenience", and finally realizes the comprehensive technical goals of high load, high stability, easy maintenance, and low cost required by the special vehicle frame structure.

[0073] In this embodiment, a support turntable flange 4 with a hole in the middle is arranged at the tail of the vehicle frame, facilitating the upper-mounted equipment and installation staff to repair the equipment. A detachable walking platform structure is additionally installed. The walking platform decking 20 and the walking platform frame welding 19 are fixed by bolts, facilitating the disassembly of the decking and shortening the vehicle maintenance time. A pull-out ladder 11 is welded and fixed to the frame of the first upper-mounted combined bracket 10, facilitating the staff to operate and repair the equipment. After canceling the front cross beam of the vehicle frame, the installation space for components such as sensors and wiring harnesses is increased. The maintenance optimization measures cover the front, middle, and rear sections of the vehicle frame, and the above measures are combined with each other to improve the comprehensive maintenance efficiency of the vehicle frame.

[0074] By simplifying the structure, such as reducing redundant components, and optimizing the process, such as integrally welding the comprehensive reinforcing cross beam 5 and the thrust rod support 6, the manufacturing cost is reduced while the production consistency is improved.

[0075] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. The frame structure of a special vehicle with variable cross-sections and high load capacity, characterized in that, It includes a first longitudinal beam and a second longitudinal beam adopting a stepped structure with multiple different cross-section forms. The first longitudinal beam and the second longitudinal beam are symmetrically arranged, and an integrated strengthening cross beam and multiple cross beams are provided between the first longitudinal beam and the second longitudinal beam; a first upper mounting combined bracket is provided on the first longitudinal beam and the second longitudinal beam in the middle of the vehicle frame, and a second upper mounting combined bracket is provided on one side of the first longitudinal beam in the middle of the vehicle frame; above the first longitudinal beam and the second longitudinal beam at the tail of the vehicle frame, there is a support turntable flange with a hole in the middle, and a platform plate structure is provided on the circumferential side of the support turntable flange.

2. The frame structure of a special vehicle with variable cross-section and high load capacity according to claim 1, characterized in that, The multiple cross beams include a head cross beam and a tail cross beam. The head cross beam is arranged between the first longitudinal beam and the second longitudinal beam at the head of the vehicle frame, the tail cross beam is arranged between the first longitudinal beam and the second longitudinal beam at the tail of the vehicle frame, and the integrated strengthening cross beam is arranged between the first longitudinal beam and the second longitudinal beam in the middle of the vehicle frame and is connected to the support turntable flange.

3. The frame structure of a special vehicle with variable cross-section and high load capacity according to claim 1, characterized in that A thrust rod support is integrally welded to the bottom of the integrated strengthening cross beam; The integrated strengthening cross beam includes a bottom plate, a dovetail upper cover plate, two I-shaped strengthening vertical plates and two diagonal tension strengthening rib plates. Two I-shaped strengthening vertical plates are symmetrically arranged on the bottom plate at a certain distance interval. The dovetail upper cover plate is arranged on the two I-shaped strengthening vertical plates, and the two ends of the dovetail upper cover plate are respectively connected to the first longitudinal beam and the second longitudinal beam; Multiple through holes are provided on each of the two diagonal tension strengthening rib plates; the two diagonal tension strengthening rib plates are arranged between the two I-shaped strengthening vertical plates, and the upper and lower ends of the two diagonal tension strengthening rib plates are respectively connected to the dovetail upper cover plate and the bottom plate. The interval distance between the upper ends of the two diagonal tension strengthening rib plates is less than the interval distance between the lower ends of the two diagonal tension strengthening rib plates.

4. The frame structure of a special vehicle with variable cross-section and high load capacity as described in claim 1, characterized in that, The first longitudinal beam and the second longitudinal beam are arranged in a stepped structure with three-section heights. The heights of the first longitudinal beam and the second longitudinal beam in the head section of the vehicle frame are less than the heights of the first longitudinal beam and the second longitudinal beam in the middle section of the vehicle frame, and the heights of the first longitudinal beam and the second longitudinal beam in the middle section of the vehicle frame are less than the heights of the first longitudinal beam and the second longitudinal beam in the tail section of the vehicle frame.

5. The frame structure of a special vehicle with variable cross-sections and high load capacity according to claim 4, characterized in that, The first upper mounting combined bracket is arranged on the upper parts of the first longitudinal beam and the second longitudinal beam in the middle section of the vehicle frame, the second upper mounting combined bracket is arranged on one side of the first longitudinal beam in the middle section of the vehicle frame, and the support turntable flange is arranged on the upper parts of the first longitudinal beam and the second longitudinal beam in the tail section of the vehicle frame.

6. The frame structure of a special vehicle with variable cross-sections and high load capacity as claimed in claim 4, wherein Multiple limiting structures are provided on the first longitudinal beam and the second longitudinal beam in the middle section of the vehicle frame. The multiple limiting structures form a constraint area to limit the upper mounting equipment; the limiting structure includes a limiting seat bottom plate, and a limiting seat is provided on the limiting seat bottom plate.

7. The frame structure of a special vehicle with variable cross-sections and high load capacity according to claim 1, characterized in that, The first upper mounting combined bracket is arranged in a rectangular frame structure, a pull-out ladder is provided on the first upper mounting combined bracket, and multiple fixed hanging locks are also provided at the four corner positions of the first upper mounting combined bracket.

8. The frame structure of a special vehicle with variable cross-sections and high load capacity according to claim 1, characterized in that, The second upper mounting combined bracket includes a first external hanging support bracket, two second external hanging support brackets and a strengthening fixed plate. One ends of the first external hanging support bracket and the two second external hanging support brackets are connected to the first longitudinal beam, and the other ends of the first external hanging support bracket and the two second external hanging support brackets are connected to the strengthening fixed plate; the strengthening fixed plate is arranged outward away from the first longitudinal beam, and the height of the strengthening fixed plate is higher than that of the first longitudinal beam.

9. The frame structure of a special vehicle with variable cross-section and high load capacity as claimed in claim 1, characterized in that, The catwalk plate structure includes a welded catwalk plate skeleton configured as a portal frame structure. The welded catwalk plate skeleton is disposed on the upper portions of the first longitudinal beam and the second longitudinal beam at the tail of the vehicle frame. A plurality of catwalk plate decks are provided on the upper part of the welded catwalk plate skeleton. A plurality of fenders are respectively provided on both sides of the lower part of the welded catwalk plate skeleton. A support turntable flange is provided in the middle of the catwalk plate deck, and a plurality of hanging rings and hooks are provided on both sides of the catwalk plate deck.

10. A special vehicle adopts the vehicle frame structure of a special vehicle with variable cross-section and high load capacity according to any one of claims 1-9.

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