Chassis framework, middle beam chassis and railway vehicle

Abstract

The invention provides an underframe framework, a center sill underframe and a railway vehicle, the underframe framework comprises a center sill body, two buffer beams and two sleeper beams, the buffer beams are connected to the first end and the second end of the center sill body respectively, the two sleeper beams are connected to the center sill body respectively perpendicular to the trend of the center sill body, the two sleeper beams are located between the buffer beams and a bogie, and the two sleeper beams are connected to the first end and the second end of the center sill body respectively. And the bottom surface of the sleeper beam obliquely extends outwards and upwards from the middle shaft. According to the chassis framework, the structure that the middle beam body, the sleeper beam and the buffer beam are combined is adopted, the extending directions of the sleeper beam and the buffer beam are perpendicular to the middle beam body, the longitudinal bearing performance of the middle beam body is improved, the bearing requirement of a train is met, and the middle beam body is in a full-length structural form and can be conveniently matched with the size of a bogie interface; the installation requirement of the bogie connector is met, the installation convenience is improved, and the overall use performance of a railway vehicle is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of bogie underframe structures, and more specifically, relates to an underframe skeleton, a center beam underframe and a rail vehicle. Background Art

[0002] The car body steel structure of low-speed carbon steel rail vehicles adopts a thin-walled cylindrical integral load-bearing structure. In order to increase the longitudinal load-bearing performance, the vehicle chassis often adds a load-bearing center beam, and at the same time appropriately increases the cross-section of the car body beam column. The chassis structure of the existing bogie is a traction-bolster-buffer structure chassis composed of a buffer beam, a traction beam, and a bolster beam. The bolster beam is connected to the bogie. The above structure is a traction-bolster-buffer structure chassis, which does not meet the chassis requirements of the center beam structure or does not meet the installation interface requirements. Other parts of the chassis structure also have a full-length center beam, which is a center-bolster-buffer structure chassis. Although it increases the longitudinal load-bearing performance of the chassis, it is difficult to meet the size requirements of the installation interface. Summary of the invention

[0003] The object of the present invention is to provide an underframe skeleton, a center beam underframe and a rail vehicle, which can increase the longitudinal load-bearing performance of the underframe and meet the size requirements of the bogie mounting interface.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a chassis skeleton, including a center beam body, two buffer beams and two bolster beams, the first end and the second end of the center beam body are respectively connected to the buffer beam, the buffer beam is arranged perpendicular to the direction of the center beam body, the two bolster beams are respectively connected to the center beam body perpendicular to the direction of the center beam body, and the two bolster beams are located between the two buffer beams.

[0005] In one possible implementation, the center beam body includes a middle center beam and two end center beams, the two end center beams are symmetrically arranged at the two ends of the middle center beam, the end center beams include a single center beam and a root center beam, the bottom of the single center beam is provided with a connecting cavity opening downward, the root center beam is connected to the bottom of the single center beam and is located in the connecting cavity.

[0006] In a possible implementation, an inner middle beam lower cover plate and an outer middle beam lower cover plate are provided at the bottom of the middle beam body. The inner middle beam lower cover plate extends along the direction of the middle beam body and runs through the pillow beam, and the outer middle beam lower cover plate is located at the outer end of the inner middle beam lower cover plate.

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

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

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

[0010] Compared with the prior art, the scheme shown in the embodiment of the present application adopts a structure combining a center beam body, a bolster beam and a buffer beam. The extension directions of the bolster beam and the buffer beam are respectively perpendicular to the center beam body, thereby increasing the longitudinal bearing capacity of the center beam body and meeting the bearing requirements of the train. The full-length structure of the center beam body facilitates the adaptation to the interface size of the bogie, 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 center beam chassis, which includes a chassis frame and a floor body arranged above the center beam body, main cross beams are symmetrically arranged on both sides of the center beam body, the main cross beams are arranged perpendicular to the direction of the center beam body, and the floor body is arranged above the main cross beams.

[0012] In a possible implementation, the floor body includes a plurality of floor blocks arranged in a matrix, the longitudinal welds of two adjacent floor blocks correspond to the main crossbeam, and the transverse welds of two adjacent floor blocks correspond to the middle beam body. The effect of the middle beam chassis is consistent with that of the chassis frame, which will not be described in detail here.

[0013] In some embodiments, a process support beam is further provided on the center beam body, the process support beam is parallel to the main cross beam, and the longitudinal welds of two adjacent floor panels are arranged correspondingly to the main cross beam or the process support beam.

[0014] The present invention also provides a rail vehicle, the rail vehicle comprising an underframe frame. The effects of the rail vehicle are consistent with those of the underframe frame, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of a chassis skeleton provided by an embodiment of the present invention; Figure 2 For the embodiment of the present invention Figure 1 The structural diagram of the middle beam body; Figure 3 For the embodiment of the present invention Figure 2 Schematic diagram of the explosion structure of the central beam body; Figure 4 For the embodiment of the present invention Figure 1 Schematic diagram of the partial cross-sectional structure of AA; Figure 5 For the embodiment of the present invention Figure 4 The partially enlarged structural diagram of middle Ⅰ; Figure 6 For the embodiment of the present invention Figure 4 The main structural diagram of the center disc seat; Figure 7 For the embodiment of the present invention Figure 6 A schematic diagram of the top view of the central disc seat; Figure 8 For the embodiment of the present invention Figure 1 A partial enlarged structural diagram of the center beam body; Fig. 9 For the embodiment of the present invention Figure 8 A schematic diagram of the partial cross-sectional structure of the middle BB; Fig.10 For the embodiment of the present invention Figure 8 A partial cross-sectional structural diagram of the CC; Fig.11 For the embodiment of the present invention Figure 8 Schematic diagram of the partial cross-sectional structure of DD; Fig.12 A schematic diagram of the structure of a center beam underframe provided by an embodiment of the present invention; Fig.13 For the embodiment of the present invention Fig.12 Schematic diagram of the partial cross-sectional structure of EE.

[0017] Among them, the reference numerals in the figure are: 1. Center beam body; 11. Middle center beam; 12. End center beam; 13. Single-piece center beam; 14. Root center beam; 15. Connection cavity; 16. Lower cover plate of center beam inside pillow; 17. Lower cover plate of center beam outside pillow; 18. Connection plate; 19. Center beam partition; 191. Weight reduction hole; 2. Buffer beam; 3. Pillow beam; 31. Web plate of pillow beam; 32. Lower cover plate of pillow beam; 33. End channel steel of pillow beam; 4. Core plate seat; 41. Bottom plate; 42. Center tube; 43. Rib plate; 44. Connecting vertical plate; 5. Core plate; 51. Core plate pad; 6. Floor body; 61. Single floor; 7. Main beam; 71. Lower cover plate of beam; 72. End channel steel of beam; 8. Process support beam; 9. Side bearing pad. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0020] Please also read Figures 1 to 13 The chassis skeleton, the center beam chassis and the rail vehicle provided by the present invention are now described. The chassis skeleton comprises a center beam body 1, two buffer beams 2 and two bolster beams 3. The first end and the second end of the center beam body 1 are respectively connected to the buffer beam 2, the buffer beam 2 is arranged perpendicular to the direction of the center beam body 1, the two bolster beams 3 are respectively connected to the center beam body 1 perpendicular to the direction of the center beam body 1, and the two bolster beams 3 are located between the two buffer beams 2.

[0021] Compared with the prior art, the underframe skeleton provided in the present embodiment adopts a structure combining a center beam body 1, a bolster beam 3 and a buffer beam 2. The extension directions of the bolster beam 3 and the buffer beam 2 are respectively perpendicular to the center beam body 1, thereby increasing the longitudinal bearing capacity of the center beam body 1 and meeting the bearing requirements of the train. The through-length structure of the center beam body 1 facilitates the adaptation to the interface size of the bogie, meets the installation requirements of the bogie interface, improves the convenience of installation, and ensures the overall performance of the rail vehicle.

[0022] In this embodiment, the structure of arranging two bolsters 3 and two buffer beams 2 on the center beam body 1 can improve the longitudinal bearing performance of the center beam body 1 and meet the bearing requirements of the rail vehicle. The buffer beams 2 at the first and second ends of the center beam body 1 are respectively connected to the front and rear couplers, and the bottom of the bolster 3 can be adapted to the size of the bogie interface, meeting the installation requirements of the bogie interface and improving the convenience of structural assembly.

[0023] In some possible implementations, the beam body 1 of the above characteristics is adopted as follows Figures 1 to 13 Please also refer to Figures 1 to 13 The center beam body 1 includes a middle center beam 11 and two end center beams 12. The two end center beams 12 are symmetrically arranged at the two ends of the middle center beam 11. The end center beams 12 include a single center beam 13 and a root center beam 14. The bottom of the single center beam 13 is provided with a connecting cavity 15 opening downward. The root center beam 14 is connected to the bottom of the single center beam 13 and is located in the connecting cavity 15.

[0024] In this embodiment, the center beam body 1 is relatively long and is formed by welding the middle center beam 11 and the two end center beams 12. The center beam body 1 can be made of I-beam steel with an I-shaped cross section, and the cross-sectional dimensions of the center beam body 1 are 400mm×142mm×10.5mm. During welding, the joint between the middle center beam 11 and the end center beam 12 must be more than 1500 mm away from the center of the bolster 3 and more than 500 mm to the left and right of the central cross section of the vehicle body. At the same time, the joint cannot overlap with the weld of the main cross beam 7. The welds of the first end and the second end must not be in the same cross section and must be staggered by more than 500 mm.

[0025] As a specific embodiment, the height of the end of the center beam body 1 (i.e., the end center beam 12) is set to 430 mm to meet the requirements of the coupler installation. The middle height of the middle of the bolster 3 is 310 mm, and the middle of the center beam body 1 (i.e., the middle center beam 11) is set to 400 mm.

[0026] Based on the above structure, please refer to Figure 1In order to meet the above requirements and processability, the end center beam 12 is divided into a single center beam 13 and a root center beam 14, and the single center beam 13 and the root center beam 14 are welded to form the end beam. The entire center beam body 1 includes a middle center beam 11, two single center beams 13 and two root center beams 14, and the above five parts are welded to form the entire center beam body 1.

[0027] The center beam body 1 is welded in the form of a 5.25mm double-sided V-shaped weld for the middle center beam 11 and an 8.25mm double-sided V-shaped weld for the upper wing surface. The welds at the contact with the upper floor body 6 are ground flat, and the welds are subsequently inspected after welding.

[0028] In some possible implementations, the beam body 1 of the above characteristics is adopted as follows Figures 1 to 13 Please also refer to Figures 1 to 13 The bottom of the center beam body 1 is provided with an inner center beam lower cover plate 16 and an outer center beam lower cover plate 17. The inner center beam lower cover plate 16 extends along the direction of the center beam body 1 and passes through the bolster beam 3. The outer center beam lower cover plate 17 is located at the outer end of the inner center beam lower cover plate 16.

[0029] In this embodiment, the bottom of the center beam body 1 is provided with an inner center beam lower cover plate 16 and an outer center beam lower cover plate 17 extending along the direction thereof. The inner center beam lower cover plate 16 and the outer center beam lower cover plate 17 are welded and connected to the bottom of the center beam body 1, so that the structure of the center beam body 1 is effectively strengthened.

[0030] Specifically, the plate body that is entirely located outside the bolster beam 3 is the outer center beam lower cover plate 17, and the plate body that is partially located inside the bolster beam 3 is the inner center beam lower cover plate 16. The inner center beam lower cover plate 16 is arranged to penetrate the bolster beam 3, and can structurally reinforce the position where the center beam body 1 and the bolster beam 3 are connected, thereby ensuring the structural strength of the corresponding position of the center beam body 1.

[0031] In some possible implementations, the characteristic bolster 3 is as follows: Figures 1 to 13 Please also refer to Figures 1 to 13 The bolster 3 includes a bolster web 31 and a bolster lower cover 32. The bolster web 31 is provided with two and is symmetrically located on both sides of the middle beam body 1. The bolster lower cover 32 is connected to the bottom of the two bolster webs 31. The outer end of the bolster web 31 is provided with a bolster end channel steel 33. The top of the bolster end channel steel 33 is connected to the bolster lower cover 32, and the top surface of the bolster end channel steel 33 is flush with the top surface of the middle beam body 1.

[0032] In this embodiment, the bolster 3 is in the form of a combination of a bolster web 31 and a bolster lower cover 32. The bolster web 31 is a plate-like component arranged upright. The bolster web 31 extends perpendicularly to the direction of the center beam body 1. The bolster web 31 is symmetrically arranged on both sides of the center beam body 1 to form a state of vertical intersection with the center beam body 1. The bolster lower cover 32 located below the bolster web 31 is arranged perpendicularly to the bolster web 31 to form a supporting structure located on both sides of the center beam body 1 to ensure the bearing capacity of the corresponding parts of the center beam body 1.

[0033] On this basis, the bolster end channel steel 33 arranged at the outer end of the bolster web 31 can further connect the bolster web 31 and the bolster lower cover 32, structurally strengthen the outer end position of the bolster 3, and improve the overall structural support performance of the bolster 3.

[0034] Specifically, at least two bolster webs 31 are provided above the same bolster lower cover plate 32. The bolster webs 31 are arranged at intervals along the direction of the center beam body 1, and are respectively used to connect the center beam body 1 and the bolster lower cover plate 32, which helps to improve the bearing performance of the bolster 3 and improve the overall strength of the structure.

[0035] In some possible implementations, the beam body 1 of the above characteristics is adopted as follows Figures 1 to 13 Please also refer to Figures 1 to 13 Two center beam bodies 1 are arranged in parallel, the bottoms of the two center beam bodies 1 are connected by a connecting plate 18, a center beam partition 19 is arranged between the two center beam bodies 1, and the plate surface of the center beam partition 19 is arranged perpendicular to the center beam body 1.

[0036] In this embodiment, two center beam bodies 1 are provided, and they are connected by the center beam partition 19 to form a unified whole. Each center beam body 1 can be made of an I-shaped I-beam, and the cross-sectional dimensions of the center beam body 1 are 400mm×142mm×10.5mm. During welding, the joint between the middle center beam 11 and the end center beam 12 must be more than 1500 mm away from the center of the bolster 3 and more than 500 mm to the left and right of the central section of the vehicle body. At the same time, the joint cannot overlap with the weld of the main cross beam 7. The welds of the first end and the second end must not be in the same section and must be staggered by more than 500 mm.

[0037] On the basis of the above structure, a weight-reducing hole 191 is provided in the middle of the center beam partition 19. The weight-reducing hole 191 can be set to be polygonal or circular. While ensuring the structural strength of the center beam partition 19, it also realizes the weight-reducing design of the vehicle, which is convenient for reducing material usage and achieving overall weight reduction of the vehicle.

[0038] In some embodiments, the above-mentioned characteristic bolster lower cover plate 32 can be adopted as follows Figures 1 to 13 Please also refer to Figures 1 to 13A core plate seat 4 is provided at the top of the lower cover plate 32 of the bolster beam, and a core plate 5 is provided at the bottom of the lower cover plate 32 of the bolster beam. The core plate seat 4 is located between the two center beam bodies 1, and the core plate 5 is connected to the core plate seat 4 through a connecting piece that penetrates the lower cover plate 32 of the bolster beam; the core plate seat 4 includes a bottom plate 41, a center tube 42 connected to the top of the bottom plate 41, and a rib plate 43 connected to the outer periphery of the center tube 42. The outer edges of the two rib plates 43 symmetrically located on both sides of the center tube 42 are also respectively connected to connecting vertical plates 44, and the two side edges of the connecting vertical plates 44 are respectively connected to the side walls of the adjacent sides of the two center beam bodies 1.

[0039] In this embodiment, a core plate seat 4 is arranged above the lower cover plate 32 of the bolster, and a core plate 5 is arranged below the lower cover plate 32 of the bolster. The core plate 5, the lower cover plate 32 of the bolster and the core plate seat 4 are connected by a connecting piece, so that the structure of the middle part of the bolster 3 can be strengthened. The vehicle body takes the core plate 5 as a fulcrum to bear and transmit the weight (self-weight + load) of the vehicle body and longitudinal force (traction force, impact force) and lateral force (centrifugal force, wind force) and the like.

[0040] On the basis of the above structure, two side bearing pads 9 are further provided at the bottom of the bolster lower cover plate 32. 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.

[0041] Specifically, the center height of the center beam body 1 located inside the bolster 3 is set to 292 mm, which can be adapted to the height of the bogie. The thickness of the bolster lower cover plate 32 is 10 mm. A core plate pad 51 is provided above the core plate 5 and between the bolster lower cover plate 32. The thickness of the core plate pad 51 is set to 8 mm.

[0042] Based on the same inventive concept, the embodiment of the present application further provides a center beam chassis, which includes a chassis frame and a floor body 6 arranged above the center beam body 1, main cross beams 7 are symmetrically arranged on both sides of the center beam body 1, the main cross beams 7 are arranged perpendicular to the direction of the center beam body 1, and the floor body 6 is arranged above the main cross beams 7. The effect of the above center beam chassis is consistent with that of the chassis frame, and will not be repeated here.

[0043] In this embodiment, a center beam chassis is formed by setting a floor body 6 above the chassis frame. When the floor body 6 is installed on the chassis frame, the main cross beam 7 and other cross beams are arranged according to the layout of the equipment under the vehicle, and the main cross beam 7 is used to support the upper floor body 6.

[0044] Specifically, the floor body 6 is made of 2mm thick weather-resistant steel plate, and a bolster upper cover plate corresponding to the bolster lower cover plate 32 is provided below the bottom plate 41 body, and the bolster upper cover plate is 8mm thick hot-rolled carbon steel plate.

[0045] For some possible implementations, please refer to Figures 1 to 13The floor body 6 includes a plurality of floor blocks 61 arranged in a matrix, the longitudinal welds of two adjacent floor blocks 61 correspond to the main cross beam 7 up and down, and the transverse welds of two adjacent floor blocks 61 correspond to the middle beam body 1 up and down.

[0046] In this embodiment, due to the limited width of the raw material plate, the floor body 6 can be formed by welding a plurality of floor single blocks 61 arranged in a matrix. Specifically, the welding form of the floor body 6, the main crossbeam 7 and the profile is as follows: the fillet weld has a fillet thickness of 2 mm, a 30 weld length of 150 mm, and is welded in sections at intervals.

[0047] Specifically, a beam 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 beam lower cover plate 71 to ensure the structural strength of the main beam 7 as a whole and at the end, and to provide good supporting performance for the floor body 6 above.

[0048] In some embodiments, the above-mentioned characteristic center beam body 1 can be adopted as follows Figures 1 to 13 Please also refer to Figures 1 to 13 A process support beam 8 is also provided on the middle beam body 1, and the process support beam 8 is parallel to the main beam 7. The longitudinal welds of two adjacent floor blocks 61 are arranged correspondingly to the main beam 7 or the process support beam 8 up and down.

[0049] In this embodiment, since the width of the floor body 6 is limited and the floor body 6 needs to be welded, in order to ensure that the floor does not collapse during welding, it is necessary to ensure that the joints of the floor body 6 are supported by transverse beams. Therefore, if there is no main beam 7 at the floor joints, it is necessary to add a process support beam 8 to support it, thereby ensuring the welding processability. At the same time, a process support beam 8 can also be added at the position where the distance between two adjacent main beams 7 is too large, so as to improve the flatness of the floor body 6.

[0050] Based on the same inventive concept, the embodiment of the present application also provides a rail vehicle, which includes an underframe frame. The above vehicle uses an underframe frame structure, and adopts a middle bolster-buffer structure composed of a middle beam, two buffer beams 2 and two bolster beams 3, which is convenient for achieving adaptation to the size of the bogie interface, meets the installation requirements of the bogie interface, improves the convenience of installation, and at the same time utilizes the bottom plate 41 body combined with the above middle bolster-buffer structure to ensure the overall performance of the rail vehicle.

[0051] The above are only 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 in the protection scope of the present invention.

Claims

1. The chassis frame is characterized by: The invention comprises a center beam body (1), two buffer beams (2) and two bolster beams (3), wherein the first end and the second end of the center beam body (1) are respectively connected to the buffer beam (2), the buffer beam (2) is arranged perpendicular to the direction of the center beam body (1), the two bolster beams (3) are respectively connected to the center beam body (1) perpendicular to the direction of the center beam body (1), and the two bolster beams (3) are located between the two buffer beams (2).

2. The chassis frame according to claim 1, characterized in that: The center beam body (1) comprises a middle center beam (11) and two end center beams (12), wherein the two end center beams (12) are symmetrically arranged at two ends of the middle center beam (11), and the end center beams (12) comprise a single center beam (13) and a root center beam (14), wherein a connection cavity (15) opening downward is provided at the bottom of the single center beam (13), and the root center beam (14) is connected to the bottom of the single center beam (13) and is located in the connection cavity (15).

3. The chassis frame according to claim 1, characterized in that: The bottom of the center beam body (1) is provided with an inner center beam lower cover plate (16) and an outer center beam lower cover plate (17); the inner center beam lower cover plate (16) extends along the direction of the center beam body (1) and penetrates the center beam (3); the outer center beam lower cover plate (17) is located at the outer end of the inner center beam lower cover plate (16).

4. The chassis frame according to claim 1, characterized in that: The bolster beam (3) comprises a bolster beam web (31) and a bolster beam lower cover plate (32), wherein two bolster beam webs (31) are provided and symmetrically located on both sides of the center beam body (1), and the bolster beam lower cover plate (32) is connected below the two bolster beam webs (31), and a bolster beam end channel steel (33) is provided at the outer end of the bolster beam web (31), and 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 center beam body (1).

5. The chassis frame according to claim 4, characterized in that: Two center beam bodies (1) are arranged in parallel, the bottoms of the two center beam bodies (1) are connected via a connecting plate (18), a center beam partition plate (19) is arranged between the two center beam bodies (1), and the plate surface of the center beam partition plate (19) is arranged perpendicular to the center beam body (1).

6. The chassis frame according to claim 5, characterized in that: A core plate seat (4) is provided at the top of the lower cover plate (32) of the bolster beam, and a core plate (5) is provided at the bottom of the lower cover plate (32) of the bolster beam. The core plate seat (4) is located between the two center beam bodies (1), and the core plate (5) is connected to the core plate seat (4) via a connecting piece that penetrates the lower cover plate (32) of the bolster beam; the core plate seat (4) comprises a bottom plate (41), a center tube (42) connected to the top of the bottom plate (41), and a rib plate (43) connected to the outer periphery of the center tube (42); the outer edges of the two rib plates (43) symmetrically located on both sides of the center tube (42) are also respectively connected to connecting vertical plates (44), and the two side edges of the connecting vertical plates (44) are respectively connected to the side walls of the adjacent sides of the two center beam bodies (1).

7. A middle beam chassis, characterized in that: It comprises the base frame as described in any one of claims 1 to 6 and a floor body (6) arranged above the center beam body (1), main cross beams (7) are symmetrically arranged on both sides of the center beam body (1), and the main cross beams (7) are arranged perpendicular to the direction of the center beam body (1), and the floor body (6) is arranged above the main cross beams (7).

8. The center beam underframe according to claim 7, characterized in that: The floor body (6) comprises a plurality of floor blocks (61) arranged in a matrix, the longitudinal welds of two adjacent floor blocks (61) correspond to the main cross beam (7) in the vertical direction, and the transverse welds of two adjacent floor blocks (61) correspond to the middle beam body (1) in the vertical direction.

9. The center beam underframe according to claim 8, characterized in that: A process support beam (8) is also provided on the center beam body (1), and the process support beam (8) is parallel to the main cross beam (7), and the longitudinal welds of two adjacent floor single blocks (61) are arranged correspondingly to the main cross beam (7) or the process support beam (8) up and down.

10. A rail vehicle, characterized in that: The rail vehicle comprises the center beam chassis as described in any one of claims 7-9.

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