Chassis frame, center sill chassis and rail vehicle

Abstract

This invention provides a chassis frame, a center beam chassis, and a rail vehicle, comprising a center beam body, two buffer beams, and two sleeper beams. Buffer beams are connected to one and two ends of the center beam body, respectively. The two sleeper beams are connected to the center beam body perpendicular to its direction and located between the buffer beams and the bogie. The bottom surface of the sleeper beams extends outward and upward from the central axis. The chassis frame provided by this invention adopts a structure combining the center beam body, sleeper beams, and buffer beams. The extension directions of the sleeper beams and buffer beams are perpendicular to the center beam body, increasing the longitudinal load-bearing capacity of the center beam body and meeting the load-bearing requirements of the train. The continuous structure of the center beam body facilitates adaptation to the bogie interface dimensions, meets the bogie interface installation requirements, improves installation convenience, and ensures the overall performance of the rail vehicle.

Description

Technical Field

[0001] This invention belongs to the technical field of bogie underframe structure, and more specifically, relates to a underframe skeleton, a center beam underframe, and a rail vehicle. Background Technology

[0002] The car body steel structure of low-speed carbon steel rail vehicles adopts a thin-walled cylindrical integral load-bearing structure. To increase longitudinal load-bearing capacity, a load-bearing center beam is often added to the vehicle underframe, and the cross-section of the car body beams and columns is also appropriately increased. The existing bogie underframe structure is a traction-restor-shelter structure underframe composed of a buffer beam, traction beam, and sleeper beam. The sleeper beam interface with the bogie, as described above, is a traction-restor-shelter structure underframe, which does not meet the underframe requirements of a center beam structure or the installation interface requirements. Other parts of the underframe structure also have a continuous center beam, forming a center-sleeper-shelter structure underframe. Although this increases the longitudinal load-bearing capacity of the underframe, it is difficult to meet the dimensional requirements of the installation interface. Summary of the Invention

[0003] The purpose of this invention is to provide a chassis frame, a central beam chassis, and a rail vehicle that can increase the longitudinal load-bearing capacity of the chassis while meeting the dimensional requirements of the bogie mounting interface.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a base frame is provided, including a central beam body, two buffer beams and two bolster beams. The buffer beams are respectively connected to one end and the other end of the central beam body. The buffer beams are arranged perpendicular to the direction of the central beam body. The two bolster beams are respectively connected to the central beam body perpendicular to the direction of the central beam body. The two bolster beams are located between the two buffer beams.

[0005] In one possible implementation, the main body of the central beam includes a central beam and two end beams. The two end beams are symmetrically arranged at both ends of the central beam. Each end beam includes a single beam and a root beam. The bottom of the single beam has a downward-opening connecting cavity. The root beam is connected to the bottom of the single beam and is located inside the connecting cavity.

[0006] In one possible implementation, the bottom of the central beam body is provided with an inner central beam lower cover plate and an outer central beam lower cover plate. The inner central beam lower cover plate extends along the direction of the central beam body and passes through the bolster beam, while the outer central beam lower cover plate is located at the outer end of the inner central beam lower cover plate.

[0007] In one possible implementation, the bolster beam includes a bolster beam web and a bolster beam lower cover plate. There are two bolster beam webs, which are symmetrically located on both sides of the main beam body. The bolster beam lower cover plate is connected to the bottom of the two bolster beam webs. The outer end of the bolster beam web is provided with a bolster beam end channel steel. The top of the bolster beam end channel steel is connected to the bolster beam lower cover plate, and the top surface of the bolster beam end channel steel is flush with the top surface of the main beam body.

[0008] In one possible implementation, two central beam bodies are arranged in parallel, with their bottoms connected by a connecting plate, and a central beam partition is provided between the two central beam bodies, with the surface of the partition perpendicular to the central beam bodies.

[0009] In some embodiments, a center plate seat is provided at the top of the lower cover plate of the bolster beam, and a center plate is provided at the bottom of the lower cover plate of the bolster beam. The center plate seat is located between the two middle beam bodies, and the center plate is connected to the center plate seat through a connector that passes through the lower cover plate of the bolster beam. The center plate seat includes a bottom plate, a central tube connected above the bottom plate, and stiffening plates connected to the outer periphery of the central tube. The outer edges of the two stiffening plates symmetrically located on both sides of the central tube are also connected to connecting upright plates. The two sides of the connecting upright plates are respectively connected to the side walls of the adjacent sides of the two middle beam bodies.

[0010] Compared with the prior art, the underframe structure provided in this application embodiment adopts a structure combining a central beam body, a sleeper beam, and a buffer beam. The extension directions of the sleeper beam and the buffer beam are perpendicular to the central beam body, which increases the longitudinal load-bearing capacity of the central beam body and meets the load-bearing requirements of the train. The full-length structure of the central beam body facilitates the adaptation to the bogie interface size, meets the installation requirements of the bogie interface, improves the convenience of installation, and ensures the overall performance of the rail vehicle.

[0011] The present invention also provides a central beam base frame, which includes a base frame skeleton and a floor body disposed above the central beam body. The central beam body is provided with main crossbeams symmetrically arranged on both sides, the main crossbeams being arranged perpendicular to the direction of the central beam body, and the floor body being disposed above the main crossbeams.

[0012] In one possible implementation, the floor body comprises several floor panels arranged in a matrix. The longitudinal welds of two adjacent floor panels correspond vertically to the main crossbeams, and the transverse welds of two adjacent floor panels correspond vertically to the central beam body. The effect of the aforementioned central beam base frame is the same as that of the base frame skeleton, and will not be elaborated further here.

[0013] In some embodiments, the central beam body is also provided with a process support beam, which is parallel to the main crossbeam, and the longitudinal welds of two adjacent floor panels are arranged vertically and vertically corresponding to the main crossbeam or the process support beam.

[0014] The present invention also provides a rail vehicle, which includes a chassis frame. The effects of the rail vehicle described above are the same as those of the chassis frame, and will not be repeated here. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the base frame provided in an embodiment of the present invention;

[0017] Figure 2 This is an embodiment of the present invention. Figure 1 Schematic diagram of the structure of the central beam;

[0018] Figure 3 This is an embodiment of the present invention. Figure 2 Exploded structural diagram of the main beam;

[0019] Figure 4 This is an embodiment of the present invention. Figure 1 A schematic diagram of a partial cross-sectional view of the AA structure;

[0020] Figure 5 This is an embodiment of the present invention. Figure 4 A partially enlarged structural diagram of section I;

[0021] Figure 6 This is an embodiment of the present invention. Figure 4 A schematic diagram of the main structure of the central plate base;

[0022] Figure 7 This is an embodiment of the present invention. Figure 6 A top view of the central plate's structure;

[0023] Figure 8 This is an embodiment of the present invention. Figure 1 A partially enlarged structural diagram of the central beam body;

[0024] Figure 9 This is an embodiment of the present invention. Figure 8 A schematic diagram of a partial cross-sectional structure of BB;

[0025] Figure 10 This is an embodiment of the present invention. Figure 8 A schematic diagram of a partial cross-sectional view of the CC structure;

[0026] Figure 11 This is an embodiment of the present invention. Figure 8 A schematic diagram of a partial cross-sectional structure of the DD;

[0027] Figure 12 This is a schematic diagram of the structure of the middle beam underframe provided in an embodiment of the present invention;

[0028] Figure 13 This is an embodiment of the present invention. Figure 12 A schematic diagram of a partial cross-sectional view of the EE.

[0029] The following are the labeling elements in the figure:

[0030] 1. Main beam body; 11. Middle beam; 12. End beam; 13. Single beam; 14. Root beam; 15. Connecting cavity; 16. Lower cover plate of inner beam; 17. Lower cover plate of outer beam; 18. Connecting plate; 19. Beam partition; 191. Weight reduction hole; 2. Buffer beam; 3. Pillar beam; 31. Pillar beam web; 32. Pillar beam lower cover plate; 33. Pillar beam end channel steel; 4. Core plate seat; 41. Base plate; 42. Central tube; 43. Rib plate; 44. Connecting vertical plate; 5. Core plate; 51. Core plate pad; 6. Floor body; 61. Floor piece; 7. Main crossbeam; 71. Crossbeam lower cover plate; 72. Crossbeam end channel steel; 8. Process support beam; 9. Side bearing pad. Detailed Implementation

[0031] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0033] Please refer to the following: Figures 1 to 13The following describes the underframe frame, the middle beam underframe, and the rail vehicle provided by the present invention. The underframe frame includes a middle beam body 1, two buffer beams 2, and two sleeper beams 3. The buffer beams 2 are respectively connected to one end and the other end of the middle beam body 1. The buffer beams 2 are arranged perpendicular to the direction of the middle beam body 1. The two sleeper beams 3 are respectively connected to the middle beam body 1 perpendicular to the direction of the middle beam body 1, and the two sleeper beams 3 are located between the two buffer beams 2.

[0034] Compared with the prior art, the underframe frame provided in this embodiment adopts a structure combining a central beam body 1, a sleeper beam 3, and a buffer beam 2. The extension directions of the sleeper beam 3 and the buffer beam 2 are perpendicular to the central beam body 1, which increases the longitudinal load-bearing capacity of the central beam body 1 and meets the load-bearing requirements of the train. The full-length structure of the central beam body 1 facilitates the adaptation to the bogie interface size, meets the installation requirements of the bogie interface, improves the convenience of installation, and ensures the overall performance of the rail vehicle.

[0035] In this embodiment, a structure with two bolster beams 3 and two buffer beams 2 installed on the central beam body 1 is adopted, which can improve the longitudinal bearing capacity of the central beam body 1 and meet the bearing requirements of the rail vehicle. The buffer beams 2 at the first and second ends of the central beam body 1 are connected to the front and rear couplers respectively. The bottom of the bolster beams 3 can be adapted to the bogie interface size, which meets the bogie interface installation requirements and improves the convenience of structural assembly.

[0036] In some possible implementations, the beam body 1 of the above features adopts, for example... Figures 1 to 13 The structure shown is provided. Please refer to it as well. Figures 1 to 13 The main body of the central beam 1 includes a central beam 11 and two end beams 12. The two end beams 12 are symmetrically arranged at both ends of the central beam 11. The end beams 12 include a single beam 13 and a root beam 14. The bottom of the single beam 13 is provided with a downward-opening connecting cavity 15. The root beam 14 is connected to the bottom of the single beam 13 and is located in the connecting cavity 15.

[0037] In this embodiment, the main beam 1 is relatively long and is formed by welding together a central beam 11 and two end beams 12. The main beam 1 can be made of I-beams with an I-shaped cross-section, and its dimensions are 400mm × 142mm × 10.5mm. During welding, the joint between the central beam 11 and the end beams 12 must be at least 1500mm from the center of the bolster beam 3 and at least 500mm from the left and right sides of the central cross-section of the vehicle body. Simultaneously, the joint must not coincide with the weld of the main cross beam 7. The welds at the first and second ends must not be on the same cross-section and must be staggered by at least 500mm.

[0038] In one specific embodiment, the height of the end of the middle beam body 1 (i.e., the end middle beam 12) is set to 430mm to meet the requirements for coupler installation. The height of the middle part of the bolster beam 3 is 310mm, and the height of the middle part of the middle beam body 1 (i.e., the middle beam 11) is set to 400mm.

[0039] Based on the above structure, please refer to Figure 1 To meet the above requirements and for manufacturability, the end beam 12 is divided into a single beam 13 and a root beam 14. The single beam 13 and the root beam 14 are welded together to form the end beam. The entire beam body 1 includes a central beam 11, two single beams 13, and two root beams 14. These five parts are welded together to form the entire beam body 1.

[0040] The welding of the central beam body 1 is as follows: the weld of the central beam 11 is a 5.25mm double-sided V-shaped weld, and the upper flange is an 8.25mm double-sided V-shaped weld. The weld at the contact point with the upper floor body 6 is ground smooth. After the weld is completed, it is inspected for defects.

[0041] In some possible implementations, the beam body 1 of the above features adopts, for example... Figures 1 to 13 The structure shown is provided. Please refer to it as well. Figures 1 to 13 The bottom of the main beam 1 is provided with an inner middle beam lower cover plate 16 and an outer middle beam lower cover plate 17. The inner middle beam lower cover plate 16 extends along the direction of the main beam 1 and passes through the pillow beam 3. The outer middle beam lower cover plate 17 is located at the outer end of the inner middle beam lower cover plate 16.

[0042] In this embodiment, the bottom of the central beam body 1 is provided with an inner central beam lower cover plate 16 and an outer central beam lower cover plate 17 extending along its direction. The inner central beam lower cover plate 16 and the outer central beam lower cover plate 17 are welded to the bottom of the central beam body 1, so that the central beam body 1 is effectively structurally reinforced.

[0043] Specifically, the plate located entirely outside the bolster beam 3 is the outer middle beam lower cover plate 17, and the plate partially located inside the bolster beam 3 is the inner middle beam lower cover plate 16. The inner middle beam lower cover plate 16 is installed through the bolster beam 3, which can structurally reinforce the position where the middle beam body 1 is connected to the bolster beam 3, thus ensuring the structural strength of the corresponding position of the middle beam body 1.

[0044] In some possible implementations, the aforementioned characteristic pillow beam 3 adopts, for example... Figures 1 to 13 The structure shown is provided. Please refer to it as well. Figures 1 to 13The bolster beam 3 includes a bolster beam web 31 and a bolster beam lower cover plate 32. There are two bolster beam webs 31, which are symmetrically located on both sides of the middle beam body 1. The bolster beam lower cover plate 32 is connected to the bottom of the two bolster beam webs 31. The outer end of the bolster beam web 31 is provided with a bolster beam end channel steel 33. The top of the bolster beam end channel steel 33 is connected to the bolster beam lower cover plate 32, and the top surface of the bolster beam end channel steel 33 is flush with the top surface of the middle beam body 1.

[0045] In this embodiment, the bolster beam 3 adopts the form of a combination of a bolster beam web 31 and a bolster beam lower cover plate 32. The bolster beam web 31 is an upright plate-shaped member that extends perpendicularly to the direction of the middle beam body 1. The bolster beam web 31 is symmetrically arranged on both sides of the middle beam body 1, forming a state of perpendicular intersection with the middle beam body 1. The bolster beam lower cover plate 32, located below the bolster beam web 31, is arranged perpendicularly to the bolster beam web 31, forming a support structure on both sides of the middle beam body 1 to ensure the load-bearing capacity of the corresponding parts of the middle beam body 1.

[0046] Based on this, the pillow beam end channel steel 33 provided at the outer end of the pillow beam web 31 can further connect the pillow beam web 31 and the pillow beam lower cover plate 32, strengthen the outer end of the pillow beam 3, and improve the overall structural support performance of the pillow beam 3.

[0047] Specifically, at least two pillow beam webs 31 are provided above the same pillow beam under cover plate 32. The pillow beam webs 31 are spaced apart along the direction of the middle beam body 1 and are used to connect the middle beam body 1 and the pillow beam under cover plate 32, which helps to improve the load-bearing performance of the pillow beam 3 and improve the overall strength of the structure.

[0048] In some possible implementations, the beam body 1 of the above features adopts, for example... Figures 1 to 13 The structure shown is provided. Please refer to it as well. Figures 1 to 13 Two central beam bodies 1 are arranged in parallel. The bottoms of the two central beam bodies 1 are connected by a connecting plate 18. A central beam partition 19 is provided between the two central beam bodies 1. The plate surface of the central beam partition 19 is set perpendicular to the central beam body 1.

[0049] In this embodiment, two central beam bodies 1 are provided and connected by a central beam partition 19 to form a unified whole. Each central beam body 1 can be made of an I-beam with an I-shaped cross-section, and the cross-sectional dimensions of the central beam body 1 are 400mm × 142mm × 10.5mm. During welding, the joint between the central beam 11 and the end beam 12 must be at least 1500mm away from the center of the bolster beam 3 and at least 500mm away from the left and right sides of the central cross-section of the vehicle body. At the same time, the joint must not coincide with the weld of the main cross beam 7. The welds at the first and second ends must not be on the same cross-section and must be staggered by at least 500mm.

[0050] Based on the above structure, a weight reduction hole 191 is provided in the middle of the middle beam partition 19. The weight reduction hole 191 can be set as polygonal or circular. While ensuring the structural strength of the middle beam partition 19, it also realizes the weight reduction design of the vehicle, which facilitates the reduction of materials and achieves the overall weight reduction of the vehicle.

[0051] In some embodiments, the aforementioned characteristic pillow beam under cover plate 32 can be adopted as follows: Figures 1 to 13 The structure shown is provided. Please refer to it as well. Figures 1 to 13 The top of the lower cover plate 32 of the pillow beam is provided with a center plate seat 4, and the bottom of the lower cover plate 32 of the pillow beam is provided with a center plate 5. The center plate seat 4 is located between the two middle beam bodies 1. The center plate 5 is connected to the center plate seat 4 through a connector that passes through the lower cover plate 32 of the pillow beam. The center plate seat 4 includes a base plate 41, a central tube 42 connected above the base plate 41, and stiffening plates 43 connected to the outer periphery of the central tube 42. The outer edges of the two stiffening plates 43 symmetrically located on both sides of the central tube 42 are also connected to connecting upright plates 44. The two sides of the connecting upright plates 44 are connected to the side walls of the adjacent sides of the two middle beam bodies 1 respectively.

[0052] In this embodiment, a center plate seat 4 is provided above the lower cover plate 32 of the bolster beam, and a center plate 5 is provided below the lower cover plate 32. The center plate 5, the lower cover plate 32 of the bolster beam, and the center plate seat 4 are connected by a connector, which can strengthen the structure of the middle part of the bolster beam 3. The vehicle body uses the center plate 5 as a fulcrum to bear and transmit the weight of the vehicle body (self-weight + load), as well as longitudinal forces (traction force, impact force) and lateral forces (centrifugal force, wind force), etc.

[0053] Based on the above structure, the bottom of the lower cover plate 32 of the bolster beam is also provided with two side bearing pads 9. The two side bearing pads 9 are symmetrically located on both sides of the center plate 5. The center plate 5 and the side bearing pads 9 are both connected to the bogie interface.

[0054] Specifically, the height of the center beam body 1 inside the pillow beam 3 is set to 292mm, which can be adapted to the height of the bogie. The thickness of the pillow beam lower cover plate 32 is 10mm. A center plate pad 51 is provided between the center plate 5 and the pillow beam lower cover plate 32, and the thickness of the center plate pad 51 is set to 8mm.

[0055] Based on the same inventive concept, this application also provides a central beam base frame, which includes a base frame skeleton and a floor body 6 disposed above the central beam body 1. Main crossbeams 7 are symmetrically arranged on both sides of the central beam body 1, with the main crossbeams 7 arranged perpendicular to the direction of the central beam body 1. The floor body 6 is disposed above the main crossbeams 7. The effect of the aforementioned central beam base frame is the same as that of the base frame skeleton, and will not be described again here.

[0056] In this embodiment, a central beam underframe is formed by setting a floor body 6 above the underframe frame. When the floor body 6 is installed on the underframe frame, the main crossbeam 7 and other crossbeams are arranged according to the layout of the equipment under the vehicle. The main crossbeam 7 is used to support the floor body 6 above.

[0057] Specifically, the floor body 6 is made of 2mm thick weathering steel plate, and the bottom plate 41 is provided with a pillow beam upper cover plate corresponding to the lower cover plate 32 of the pillow beam. The pillow beam upper cover plate is made of 8mm thick hot-rolled carbon steel plate.

[0058] Please refer to some possible implementation methods as well. Figures 1 to 13 The floor body 6 includes several floor blocks 61 arranged in a matrix. The longitudinal welds of two adjacent floor blocks 61 correspond vertically to the main crossbeam 7, and the transverse welds of two adjacent floor blocks 61 correspond vertically to the central beam body 1.

[0059] In this embodiment, due to the limited size of the raw material plates, the floor body 6 can be formed by welding together several floor panels 61 arranged in a matrix. Specifically, the welding forms of the floor body 6, the main beam 7, and the profile are as follows: the fillet weld thickness is 2mm, and the 30mm weld is welded in segments with a length of 150mm at intervals.

[0060] Specifically, a lower cover plate 71 is provided below the main beam 7, and a beam end channel steel 72 is provided at the end of the lower cover plate 71 to ensure the overall structural strength of the main beam 7 and its ends, and to provide good support for the floor body 6 above.

[0061] In some embodiments, the beam body 1 in the above features can be adopted as follows: Figures 1 to 13 The structure shown is provided. Please refer to it as well. Figures 1 to 13 The main beam 1 is also provided with a process support beam 8, which is parallel to the main crossbeam 7. The longitudinal welds of two adjacent floor panels 61 are correspondingly set to the main crossbeam 7 or the process support beam 8.

[0062] In this embodiment, due to the limited width of the floor panel 6 and the need for welding, to ensure that the floor panel does not collapse during welding, it is necessary to ensure that there are transverse beams supporting the joints of the floor panel 6. Therefore, if there is no main crossbeam 7 at the floor panel joint, an additional process support beam 8 is required to support it, thereby ensuring the weldability. At the same time, process support beams 8 can also be added where the distance between two adjacent main crossbeams 7 is too large, in order to improve the flatness of the floor panel 6.

[0063] Based on the same inventive concept, this application also provides a rail vehicle, which includes a chassis frame. The vehicle utilizes a chassis frame structure, employing a central beam, two buffer beams 2, and two sleeper beams 3 combined into a central sleeper buffer structure. This facilitates adaptation to the bogie interface dimensions, meets the bogie interface installation requirements, and improves installation convenience. Simultaneously, the base plate 41, combined with the aforementioned central sleeper buffer structure, ensures the overall performance of the rail vehicle.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A base frame, characterized in that, It includes a central beam body (1), two buffer beams (2) and two bolster beams (3). The buffer beams (2) are connected to one end and the other end of the central beam body (1). The buffer beams (2) are arranged perpendicular to the direction of the central beam body (1). The two bolster beams (3) are connected to the central beam body (1) perpendicular to the direction of the central beam body (1). The two bolster beams (3) are located between the two buffer beams (2). The main body (1) of the middle beam includes a middle beam (11) and two end beams (12). The two end beams (12) are symmetrically arranged at both ends of the middle beam (11). The end beams (12) include a single beam (13) and a root beam (14). The bottom of the single beam (13) is provided with a downward-opening connecting cavity (15). The root beam (14) is connected to the bottom of the single beam (13) and is located in the connecting cavity (15). The bolster beam (3) includes a bolster beam web (31) and a bolster beam lower cover plate (32). The bolster beam web (31) has two symmetrically located on both sides of the middle beam body (1). The bolster beam lower cover plate (32) is connected to the bottom of the two bolster beam webs (31). The outer end of the bolster beam web (31) is provided with a bolster beam end channel steel (33). The top of the bolster beam end channel steel (33) is connected to the bolster beam lower cover plate (32), and the top surface of the bolster beam end channel steel (33) is flush with the top surface of the middle beam body (1).

2. The chassis frame as described in claim 1, characterized in that, The bottom of the central beam body (1) is provided with an inner central beam lower cover plate (16) and an outer central beam lower cover plate (17). The inner central beam lower cover plate (16) extends along the direction of the central beam body (1) and passes through the pillow beam (3). The outer central beam lower cover plate (17) is located at the outer end of the inner central beam lower cover plate (16).

3. The chassis frame as described in claim 1, characterized in that, Two central beam bodies (1) are arranged in parallel. The bottoms of the two central beam bodies (1) are connected by a connecting plate (18). A central beam partition (19) is provided between the two central beam bodies (1). The plate surface of the central beam partition (19) is perpendicular to the central beam body (1).

4. The chassis frame as described in claim 3, characterized in that, The top of the lower cover plate (32) of the pillow beam is provided with a center plate seat (4), and the bottom of the lower cover plate (32) of the pillow beam is provided with a center plate (5). The center plate seat (4) is located between the two middle beam bodies (1). The center plate (5) is connected to the center plate seat (4) through a connector that passes through the lower cover plate (32). The center plate seat (4) includes a bottom plate (41), a central tube (42) connected above the bottom plate (41), and stiffening plates (43) connected to the outer periphery of the central tube (42). The outer edges of the two stiffening plates (43) symmetrically located on both sides of the central tube (42) are also connected to connecting upright plates (44). The two sides of the connecting upright plates (44) are respectively connected to the side walls of the two middle beam bodies (1) on adjacent sides.

5. A type of central beam underframe, characterized in that, Includes the base frame as described in any one of claims 1-4 and a floor body (6) disposed above the middle beam body (1), wherein the middle beam body (1) is provided with main crossbeams (7) symmetrically on both sides, the main crossbeams (7) are disposed perpendicular to the direction of the middle beam body (1), and the floor body (6) is disposed above the main crossbeams (7).

6. The central beam underframe as described in claim 5, characterized in that, The floor body (6) includes several floor blocks (61) arranged in a matrix. The longitudinal welds of two adjacent floor blocks (61) correspond vertically to the main crossbeam (7), and the transverse welds of two adjacent floor blocks (61) correspond vertically to the central beam body (1).

7. The underframe of the central beam as described in claim 6, characterized in that, The main beam body (1) is also provided with a process support beam (8), which is parallel to the main crossbeam (7). The longitudinal welds of two adjacent floor blocks (61) are arranged vertically and vertically corresponding to the main crossbeam (7) or the process support beam (8).

8. A rail vehicle, characterized in that, The rail vehicle includes the central beam underframe as described in any one of claims 5-7.

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