Railway flat car body and longitudinal beam of railway flat car

Abstract

The application discloses a railway flat car body and a longitudinal beam of the railway flat car. The longitudinal beam comprises an upper beam body and a lower beam body. The lower beam body is arranged below the upper beam body and is installed on the middle region of the upper beam body in the longitudinal direction through a connecting piece. The lower beam body comprises two end beam modules and a middle beam module. The two end beam modules are installed on the longitudinal two sides of the middle beam module through connecting pieces. The middle beam module is an equal-height beam body. At least a part of the end beam module in the longitudinal direction is a variable-height beam body. In the longitudinal direction, the height of the variable-height beam body gradually increases in the direction close to the middle beam module. The longitudinal beam has less welding, higher green production level and is beneficial to the reasonable distribution of the strength of different regions of the longitudinal beam, thereby reducing the weight.

Description

Technical Field

[0001] This invention relates to the field of railway vehicle technology, specifically to a railway flatcar body and a railway flatcar longitudinal beam. Background Technology

[0002] Railway flatcars are railway vehicles mainly used in logistics transportation. They have many advantages such as high transportation efficiency, low transportation cost, convenient intermodal transport, and less cargo damage. They are the main transport vehicles for modern logistics and multimodal transport.

[0003] A railway flatcar consists of a car body, which includes multiple longitudinal beams and crossbeams connecting adjacent longitudinal beams. The longitudinal beams have a fish-belly shaped structure, being low at both ends and high in the middle. In related technologies, the longitudinal beams are formed by integral welding of H-beams, with a relatively long weld length, typically reaching 12m. This makes it difficult to collect welding fumes. Furthermore, the thickness of each part of the H-beam is a fixed value and cannot be adjusted, resulting in excessive overall strength reserves and a large self-weight of the longitudinal beams. This is detrimental to the assembly, transportation, and processing of the longitudinal beams, and also hinders the lightweighting of the railway flatcar.

[0004] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects remains a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a railway flatcar body and a railway flatcar longitudinal beam, wherein the longitudinal beam has fewer welds, a higher level of green production, and is conducive to the rational distribution of strength in different areas of the longitudinal beam, thereby reducing weight.

[0006] To solve the above-mentioned technical problems, the present invention provides a longitudinal beam for a railway flatcar, comprising an upper beam and a lower beam. The lower beam is located below the upper beam and is installed in the middle longitudinal region of the upper beam via connectors. The lower beam includes two end beam modules and one middle beam module. Both end beam modules are installed on both longitudinal sides of the middle beam module via connectors. The middle beam module is a beam of uniform height, and the end beam modules are at least partially variable height beams in the longitudinal direction, with the height of the variable height beams gradually increasing along the direction close to the middle beam module.

[0007] Compared with related technologies, the above solution has the following technical advantages:

[0008] 1) The upper beam and lower beam are separate structures. The end beam modules and middle beam modules of the lower beam are also separate structures. In practical applications, the wall thickness and strength of each separate part can be easily adjusted as needed, which can largely avoid over-design of strength and thus effectively reduce the self-weight of the longitudinal beam. This facilitates the assembly, transportation and assembly of the longitudinal beam, and also contributes to the lightweight design of the vehicle body.

[0009] 2) The upper beam and the lower beam are connected by connectors, and the end beam modules and the middle beam modules are connected by connectors. Compared with the welding method, the connector connection does not have the problem of collecting welding fumes, has lower energy consumption, and significantly improves the green level of the vehicle body manufacturing process, which is more conducive to environmental protection.

[0010] 3) The lower beam is installed in the middle of the upper beam in the longitudinal direction. The longitudinal impact and traction load of the railway flatcar body is mainly borne by the upper beam body and will not affect the connection area between the upper and lower beam bodies. In other words, the connector does not need to bear the longitudinal impact and traction load of the railway flatcar body. The shear stress borne by the connector is small and the connector is not easy to be damaged, which helps to ensure the connection reliability between the upper and lower beam bodies.

[0011] 4) The lower beam is installed in the middle of the upper beam in the longitudinal direction. The middle beam module is a beam of equal height, and the end beam modules are at least partially beams of variable height in the longitudinal direction, so as to form a fish belly-shaped structure design with low ends and high middle, which can ensure the structural strength requirements of the longitudinal beam.

[0012] Optionally, the upper beam includes a foundation beam and multiple auxiliary components, the foundation beam extending longitudinally, and each of the auxiliary components being installed on the foundation beam via connectors.

[0013] Optionally, the foundation beam is a beam of equal height, and the foundation beam is shaped like a zigzag, including a U-shaped part and a wing plate part. The U-shaped part includes a bottom plate and two side plates. The wing plate part is located at the end of the side plate away from the bottom plate, and the lower beam is installed on the wing plate part.

[0014] Optionally, the auxiliary components include at least one of the following: a front follower plate seat, a rear follower plate seat, a center plate seat, a first reinforcing seat, an impact seat connecting plate, and an impact seat.

[0015] Optionally, the auxiliary components also include a cover plate and an upper center plate. The cover plate is installed on the foundation beam, and the upper center plate is located below the cover plate. The center plate seat, the cover plate, and the upper center plate are all connected by connectors.

[0016] Optionally, the end beam module includes an end lower cover plate and two first side beams. Both first side beams are mounted on the end lower cover plate, and the two first side beams are arranged opposite each other in the transverse direction. Both first side beams are connected to the upper beam body through connectors.

[0017] Optionally, the first side beam is L-shaped, including a horizontal plate and a vertical plate. The vertical plate is connected to the lower end cover plate, and the horizontal plate is connected to the upper beam body through a connector.

[0018] Optionally, the end beam module further includes a second reinforcing seat, which is used to connect at least two of the first side beam portions.

[0019] Optionally, the end cover plate includes an upper plate and a lower plate that are staggered in the vertical direction. The upper plate and the lower plate are connected by an inclined plate. The inclined plate, the upper plate, and the lower plate are all set at an angle. The upper plate is connected to the upper beam body by a connector, and the lower plate is connected to the middle beam module by a connector.

[0020] Optionally, the lower beam further includes a first connecting seat, which is located between the two first side beams. The end cover plate and the two first side beams are connected to the first connecting seat via connectors, and the first connecting seat is also connected to the middle beam module via connectors.

[0021] Optionally, the lower beam further includes a second connecting seat, which is located laterally outside the first side beam. The second connecting seat is connected to the first side beam via a connector, and the second connecting seat is also connected to the middle beam module via a connector.

[0022] Optionally, the middle beam module includes two second side beams and multiple third reinforcing seats. Each of the third reinforcing seats is connected to the two second side beams via a connector, and the two second side beams are connected to the upper beam via a connector.

[0023] Optionally, the second side beam is U-shaped and includes an upper side plate, a lower side plate, and a side upright plate. The side upright plate connects the upper side plate and the lower side plate. The upper side plate is connected to the upper beam body through a connector, and the lower side plate is connected to the end beam module through a connector.

[0024] Optionally, the connector is a bolt or a rivet.

[0025] The present invention also provides a railway flatcar body, including a longitudinal beam, wherein the longitudinal beam is the same as the longitudinal beam of the railway flatcar described above.

[0026] Since the longitudinal beam of the railway flatcar already possesses the aforementioned technical effects, the car body of the railway flatcar with the same longitudinal beam should also possess similar technical effects, so it will not be elaborated upon here. Attached Figure Description

[0027] Figure 1 A schematic diagram of a specific embodiment of the railway flatcar provided by the present invention;

[0028] Figure 2 for Figure 1 Structural diagram of the central beam;

[0029] Figure 3 for Figure 2 The front view;

[0030] Figure 4 for Figure 3 Structural diagram of the upper and middle beams;

[0031] Figure 5 for Figure 4 A bottom view;

[0032] Figure 6 This is a diagram of the internal structure of the upper beam.

[0033] Figure 7 This is a structural schematic diagram of the lower beam.

[0034] Figure 8 for Figure 7 A magnified view of a portion of region A in the middle;

[0035] Figure 9 for Figure 7 Top view;

[0036] Figure 10 This is a structural schematic diagram of the end beam module;

[0037] Figure 11 for Figure 10 Top view;

[0038] Figure 12 This is a structural schematic diagram of the central beam module;

[0039] Figure 13 This is a schematic diagram of the structure of the first connecting seat.

[0040] The annotations in the attached figures are explained as follows:

[0041] 1. Middle beam, 11. Upper beam, 111. Foundation beam, 112. Front slab support, 113. Rear slab support.

[0042] 114. Impact plate seat, 115. First reinforcing seat, 116. Impact seat connecting plate, 117. Impact seat, 118. Cover plate.

[0043] 119 Upper center plate, 12 Lower beam body, 121 End beam module, 121a End lower cover plate, 121a-1 Upper plate, 121a-2 Lower plate, 121a-3 Inclined plate, 121b First side beam, 121b-1 Horizontal plate, 121b-2 Vertical plate, 121c Second reinforcing seat, 122 Middle beam module, 122a Second side beam, 122a-1 Upper side plate, 122a-2 Lower side plate, 122a-3 Side vertical plate, 122b Third reinforcing seat, 123 First connecting seat, 123a Connecting side plate, 123b Connecting bottom plate, 123c Connecting partition, 124 Second connecting seat, 13 Connecting piece;

[0044] 2 side beams;

[0045] 3. Crossbeams. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] In embodiments of the present invention, the terms "first," "second," and "third" 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 with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0049] In the description of the embodiments of the present invention, the term "multiple" refers to two or more. Furthermore, when using "multiple" to describe the quantity of different components, it does not indicate a quantitative relationship between these components.

[0050] In this embodiment of the invention, "longitudinal" refers to the running direction of the railway flatcar, and also to the length direction of the railway flatcar; within the running plane of the railway flatcar, the direction perpendicular to "longitudinal" is "lateral", which also refers to the width direction of the railway flatcar; the direction perpendicular to the running plane of the railway flatcar is "up and down", wherein the direction relatively away from the running plane is "up", and the direction relatively close to the running plane is "down", which also refers to the height direction of the railway flatcar.

[0051] In the description of embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0052] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a specific embodiment of the railway flatcar provided by the present invention.

[0053] like Figure 1 As shown, the present invention provides a railway flatcar body, including a center beam 1 and two side beams 2, which are located on the transverse sides of the center beam 1 respectively. A crossbeam 3 can also be configured between the center beam 1 and the side beams 2 to connect the center beam 1 and the side beams 2, thereby improving the structural strength of the car body.

[0054] In this embodiment of the invention, both the central beam 1 and the side beams 2 extend longitudinally; therefore, both the central beam 1 and the side beams 2 can be referred to as longitudinal beams. For ease of description, the following embodiments of the invention will use the central beam 1 as an example for illustration.

[0055] Please refer to Figures 2-13 , Figure 2 for Figure 1 Structural diagram of the central beam. Figure 3 for Figure 2 Front view, Figure 4 for Figure 3 Structural diagram of the upper and middle beams. Figure 5 for Figure 4 The bottom view, Figure 6 This is a diagram of the internal structure of the upper beam. Figure 7 This is a structural schematic diagram of the lower beam. Figure 9 for Figure 7 Top view, Figure 10 This is a structural schematic diagram of the end beam module. Figure 11 for Figure 10 Top view, Figure 12 This is a structural schematic diagram of the central beam module. Figure 13 This is a schematic diagram of the structure of the first connecting seat.

[0056] like Figure 2 and Figure 3As shown, the middle beam 1 includes a split upper beam 11 and a lower beam 12. The lower beam 12 is located below the upper beam 11 and is installed in the middle of the upper beam 11 in the longitudinal direction. This can well realize the fish-belly-shaped structural design of the middle beam 1, which is low at both ends and high in the middle, and can ensure the structural strength requirements.

[0057] Furthermore, the aforementioned split design allows the upper beam 11 and the lower beam 12 to be designed and manufactured separately, so that the wall thickness and strength of the upper beam 11 and the lower beam 12 can be adjusted as needed. This can largely avoid over-designing the strength, thereby effectively reducing the self-weight of the middle beam 1, facilitating the assembly, transportation and assembly of the middle beam 1, and also contributing to the lightweight design of the vehicle body.

[0058] More importantly, the upper beam 11 and the lower beam 12 are connected by a connector 13. Compared with the welding method in related technologies, the connection between the upper beam 11 and the lower beam 12 does not have the problem of collecting welding fumes, resulting in lower energy consumption, significantly improving the green level of the vehicle body manufacturing process, and being more conducive to environmental protection.

[0059] Furthermore, since the lower beam 12 is located only in the longitudinal middle region of the upper beam 11, the longitudinal impact and traction loads of the railway flatcar are mainly borne by the upper beam 11, and basically do not act on the connection area between the upper beam 11 and the lower beam 12. In other words, the connector 13 basically does not need to bear the longitudinal impact and traction loads of the railway flatcar, the shear stress borne by the connector 13 is small, and the connector 13 is not easily damaged, which helps to ensure the connection reliability between the upper beam 11 and the lower beam 12.

[0060] The aforementioned connector 13 can specifically be a rivet or a bolt. The specific structure and strength design of the rivet and bolt are not limited here. In practical applications, those skilled in the art can configure them according to specific needs, as long as the requirements for use are met.

[0061] like Figures 4-6 As shown, the upper beam 11 may include a foundation beam 111 and multiple auxiliary components. The foundation beam 111 is a longitudinally extending beam, primarily used to transmit longitudinal impact and traction loads from the railway flatcar body. Each auxiliary component can be installed on the foundation beam 111 via connectors 13 to reduce welding fumes, thereby improving the level of green production.

[0062] The foundation beam section 111 can specifically be a beam of equal height. (Combined with...) Figures 4-6The foundation beam 111 can be shaped like a "Z" and includes a U-shaped section and a flange section. The U-shaped section can include a bottom plate and two side plates, which can be arranged opposite each other in the transverse direction. The flange section can be located at the end of the side plate away from the bottom plate. The lower beam 12 can be specifically installed on the flange section. In practical applications, the foundation beam 111 can be made of cold-formed profiles to ensure structural strength.

[0063] It should be understood that the specific structural form of the foundation beam 111 is not limited to the aforementioned cold-formed Z-shaped beam; other structural forms can also be used, as long as they meet the requirements of use. For example, the foundation beam 111 can also include two separate beams arranged horizontally, and then these two separate beams are connected by structural members such as connecting beams to form a separate foundation beam 111, which is also feasible.

[0064] The types of auxiliary components can vary, depending on the specific usage requirements of the central beam 1. Figures 4-6 In some embodiments, the auxiliary components may include a front slave plate seat 112, a rear slave plate seat 113, a center plate seat 114, a first reinforcing seat 115, an impact seat connecting plate 116, an impact seat 117, a cover plate 118, and an upper center plate 119.

[0065] Taking the aforementioned cold-formed U-shaped beam as an example, the front axle plate seat 112, rear axle plate seat 113, center plate seat 114, and first reinforcing seat 115 can all be disposed inside the U-shaped section. The front axle plate seat 112 and rear axle plate seat 113 are used to install traction components such as couplers. The center plate seat 114 is used to install the upper center plate 119. The first reinforcing seat 115 is used to enhance the structural strength of the foundation beam section 111. There can be multiple first reinforcing seats 115, and each first reinforcing seat 115 can be disposed longitudinally at intervals inside the U-shaped section. The specific structural form of the first reinforcing seat 115 is not limited here; in practical applications, those skilled in the art can determine it based on the installation position of the first reinforcing seat 115 and the reinforcement requirements of the foundation beam section 111.

[0066] The impact seat connecting plate 116 can be disposed at one longitudinal end of the foundation beam 111, and the impact seat 117 can be installed on the impact seat connecting plate 116 to be indirectly installed on the foundation beam 111.

[0067] The cover plate 118 can be installed on the foundation beam 111. Taking the foundation beam 111 as an example of the aforementioned cold-formed Z-beam, the cover plate 118 can be connected to the two flanges via the connector 13 to enhance the structural strength of the upper beam 11.

[0068] The upper center plate 119 can be located below the cover plate 118. The connector 13 can connect the upper center plate 119, the cover plate 118, and the center plate seat 114. The cover plate 118 can improve the connection strength between the upper center plate 119 and the center plate seat 114. The upper center plate 119 is used to connect with the lower center plate of the bogie to realize the connection between the car body and the bogie.

[0069] Combination Figure 7 and Figure 9 The lower beam 12 includes two end beam modules 121 and one middle beam module 122. Both end beam modules 121 are installed on both longitudinal sides of the middle beam module 122 via connectors 13. The middle beam module 122 is a beam of uniform height, while the end beam modules 121 are at least partially variable height beams in the longitudinal direction. The height of the variable height beams gradually increases in the longitudinal direction near the middle beam module 122 in order to form a variable cross-section region for the entire middle beam 1.

[0070] With this configuration, the lower beam 12 can also be a split structure, and the end beam module 121 and the middle beam module 122 can be manufactured separately so that their respective wall thickness and strength can be adjusted as needed. This can largely avoid over-design of strength, thereby effectively reducing the self-weight of the lower beam 12 and the middle beam 1, facilitating the assembly, transportation and assembly of the middle beam 1, and contributing to the lightweight design of the vehicle body.

[0071] Furthermore, the aforementioned split design concentrates the variable cross-section area in the end beam module 121, which facilitates the design and manufacturing of the end beam module 121 and the middle beam module 122.

[0072] like Figure 10 and Figure 11 As shown, the end beam module 121 may include an end lower cover plate 121a and two first side beams 121b. Both first side beams 121b can be installed on the end lower cover plate 121a. The two first side beams 121b can be arranged opposite each other in the lateral direction, and both first side beams 121b can be connected to the upper beam body 11 through the connector 13.

[0073] The first side beam 121b and the end lower cover plate 121a can be connected by welding. This is because the longitudinal dimension of the end beam module 121 is much smaller than that of the vehicle body (generally not exceeding 2m), making dust collection relatively easy during manufacturing. Of course, the first side beam 121b and the end lower cover plate 121a can also be connected by the aforementioned connector 13. This can further reduce welding and thus further reduce welding fumes, thereby improving the environmental friendliness of production.

[0074] Here, the embodiments of the present invention do not limit the specific structural form of the first side beam 121b. In practical applications, those skilled in the art can make the settings according to specific needs, as long as they can meet the requirements of use.

[0075] In the embodiments shown in the accompanying drawings, as Figure 10 and Figure 11 As shown, the first side beam 121b can be L-shaped, including a horizontal plate 121b-1 and a vertical plate 121b-2. The vertical plate 121b-2 can be connected to the end lower cover plate 121a, and the specific connection process can be welding, connection with connector 13, etc. The horizontal plate 121b-1 can be connected to the upper beam 11 through connector 13, specifically, it can be connected to the aforementioned wing plate.

[0076] The end cover plate 121a may include an upper plate portion 121a-1 and a lower plate portion 121a-2 that are offset in the vertical direction. The upper plate portion 121a-1 and the lower plate portion 121a-2 can be connected by an inclined plate portion 121a-3. The inclined plate portion 121a-3, the upper plate portion 121a-1, and the lower plate portion 121a-2 can all be arranged at an angle to form a variable height design for the end beam module 121. The upper plate portion 121a-1 can be connected to the upper beam body 11 via a connector 13, specifically to the aforementioned cover plate 118 and wing plate portion. The lower plate portion 121a-2 can be connected to the middle beam module 122 via a connector 13 to establish the connection relationship between the end beam module 121 and the middle beam module 122.

[0077] Furthermore, the end beam module 121 may also include a second reinforcing seat 121c, which is used to connect at least the two first side beam portions 121b to enhance the structural strength of the end beam module 121. The second reinforcing seat 121c and the first side beam portions 121b can be connected by welding, because the end beam module 121 is relatively small and welding fumes are relatively easy to collect; of course, the second reinforcing seat 121c and the first side beam portions 121b can also be connected by a connector 13 to further reduce welding fumes.

[0078] In practice, the second reinforcing seat 121c can also be connected to the end lower cover plate 121a to further enhance the structural strength of the end beam module 121.

[0079] Here, the embodiments of the present invention do not limit the specific structural form of the second reinforcing base 121c. In practical applications, those skilled in the art can configure it according to specific needs, as long as it meets the requirements of use. For example, the second reinforcing base 121c can be a straight plate, such as... Figure 11 The second reinforcing seat 121c is located on the left side; alternatively, the second reinforcing seat 121c can also be a T-shaped plate, such as... Figure 11 The second reinforcing seat 121c is located on the right side.

[0080] like Figure 12 As shown, the central beam module 122 is also a split structure, including two second side beams 122a and multiple third reinforcing seats 122b. Each third reinforcing seat 122b is connected to the two second side beams 122a via a connector 13 to enhance the structural strength of the central beam module 122. Both second side beams 122a are connected to the upper beam 11 via connectors 13.

[0081] The second side beam 122a is U-shaped and can be made of cold-formed channel steel. It includes an upper side plate 122a-1, a lower side plate 122a-2, and a side upright plate 122a-3. The side upright plate 122a-3 can connect the upper side plate 122a-1 and the lower side plate 122a-2. The upper side plate 122a-1 can be connected to the upper beam 11 via a connector 13, specifically to the aforementioned wing plate. The lower side plate 122a-2 can be connected to the end beam module 121 via a connector 13, specifically to the aforementioned lower plate 121a-2. The third reinforcing seat 122b can be connected to the side upright plates 122a-3 of the two second side beams 122a.

[0082] Here, the embodiments of the present invention do not limit the specific structural form of the third reinforcing seat 122b. In practical applications, those skilled in the art can configure it according to specific needs, as long as it meets the requirements of use. For example, Figure 12 As shown, the third reinforcing seat 122b can be a U-shaped plate. The two side plates of the U-shaped plate can be connected to the second side beam 122a, and a connecting plate can also be configured between the two side plates to strengthen the structural strength of the third reinforcing seat 122b. Depending on the location of the third reinforcing seat 122b, the longitudinal dimension of the third reinforcing seat 122b can vary to meet the reinforcement requirements at different locations.

[0083] like Figure 9 As shown, the lower beam 12 may also include a first connecting seat 123. The end cover plate 121a and the two first side beam portions 121b can be connected to the first connecting seat 123 via connectors 13. Specifically, the first side beam portion 121b can be connected to the first connecting seat 123 via a vertical plate portion 121b-2. The first connecting seat 123 can also be connected to the middle beam module 122 via connectors 13, specifically via side vertical plates 122a-3.

[0084] Here, the embodiments of the present invention do not limit the specific structural form of the first connecting seat 123. In practical applications, those skilled in the art can configure it according to specific needs, as long as it meets the requirements of use. For example, Figure 13 As shown, the first connecting seat 123 may include two connecting side plates 123a, a connecting bottom plate 123b, and a connecting partition plate 123c. The connecting partition plate 123c is used to connect the two connecting side plates 123a and the connecting bottom plate 123b to improve the structural strength of the first connecting seat 123. Both connecting side plates 123a can be connected to two first side beams 121b, and both connecting side plates 123a can be connected to two second side beams 122a. The connecting bottom plate 123b can be connected to the lower plate 121a-2.

[0085] Furthermore, such as Figure 8 As shown, in some embodiments, the lower beam 12 may further include a second connecting seat 124, which may also connect the end beam module 121 and the middle beam module 122. Specifically, the second connecting seat 124 may be connected to the aforementioned transverse plate portion 121b-1 and upper side plate 122a-1.

[0086] The first connecting seat 123 is located between the two first side beam portions 121b and between the two second side beam portions 122a; therefore, the first connecting seat 123 is equivalent to an inner connecting seat. The second connecting seat 124 is located laterally outside the first side beam portion 121b and laterally outside the second side beam portion 122a; therefore, the second connecting seat 124 is equivalent to an outer connecting seat. The cooperation between the inner and outer connecting seats can significantly improve the connection reliability between the end beam module 121 and the middle beam module 122.

[0087] In the aforementioned beam 1, weight reduction holes and process holes can be configured as needed to achieve the technical purpose of convenient operation and weight reduction. The weight reduction holes and process holes are shown in the attached drawings and will not be described in detail here.

[0088] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A longitudinal beam for a railway flatcar, characterized in that, It includes an upper beam (11) and a lower beam (12), the lower beam (12) being located below the upper beam (11) and installed in the middle region of the upper beam (11) in the longitudinal direction by means of a connector (13); The lower beam (12) includes two end beam modules (121) and a middle beam module (122). The two end beam modules (121) are installed on both sides of the middle beam module (122) through connectors (13). The middle beam module (122) is a beam of equal height. The end beam modules (121) are at least partially variable height beams in the longitudinal direction. The height of the variable height beams gradually increases in the longitudinal direction close to the middle beam module (122). The upper beam (11) includes a base beam (111) and multiple auxiliary components. The base beam (111) is a beam of equal height and is a continuous beam extending longitudinally. Each of the auxiliary components is installed on the base beam (111) through a connector (13). Both longitudinal ends of the base beam (111) extend out of the lower beam (12).

2. The longitudinal beam of the railway flatcar according to claim 1, characterized in that, The foundation beam (111) is shaped like a zigzag and includes a U-shaped part and a wing plate part. The U-shaped part includes a bottom plate and two side plates. The wing plate part is located at the end of the side plate away from the bottom plate. The lower beam (12) is installed on the wing plate part.

3. The longitudinal beam of the railway flatcar according to claim 1, characterized in that, The auxiliary components include at least one of the following: front slave plate seat (112), rear slave plate seat (113), center plate seat (114), first reinforcing seat (115), impact seat connecting plate (116), and impact seat (117).

4. The longitudinal beam of the railway flatcar according to claim 3, characterized in that, The auxiliary components also include a cover plate (118) and an upper center plate (119). The cover plate (118) is installed on the foundation beam (111), and the upper center plate (119) is located on the lower side of the cover plate (118). The center plate seat (114), the cover plate (118), and the upper center plate (119) are all connected by a connector (13).

5. The longitudinal beam of the railway flatcar according to any one of claims 1-4, characterized in that, The end beam module (121) includes an end lower cover plate (121a) and two first side beams (121b). Both first side beams (121b) are mounted on the end lower cover plate (121a). The two first side beams (121b) are arranged opposite each other in the transverse direction, and both first side beams (121b) are connected to the upper beam body (11) through connectors (13).

6. The longitudinal beam of the railway flatcar according to claim 5, characterized in that, The first side beam (121b) is L-shaped and includes a horizontal plate (121b-1) and a vertical plate (121b-2). The vertical plate (121b-2) is connected to the end lower cover plate (121a), and the horizontal plate (121b-1) is connected to the upper beam (11) through a connector (13).

7. The longitudinal beam of the railway flatcar according to claim 5, characterized in that, The end beam module (121) also includes a second reinforcing seat (121c), which is used to connect at least two of the first side beam portions (121b).

8. The longitudinal beam of the railway flatcar according to claim 5, characterized in that, The end cover plate (121a) includes an upper plate (121a-1) and a lower plate (121a-2) that are staggered in the vertical direction. The upper plate (121a-1) and the lower plate (121a-2) are connected by an inclined plate (121a-3). The inclined plate (121a-3), the upper plate (121a-1), and the lower plate (121a-2) are all set at an angle. The upper plate (121a-1) is connected to the upper beam (11) through a connector (13), and the lower plate (121a-2) is connected to the middle beam module (122) through a connector (13).

9. The longitudinal beam of the railway flatcar according to claim 5, characterized in that, The lower beam (12) also includes a first connecting seat (123), which is located between the two first side beams (121b). The end cover plate (121a) and the two first side beams (121b) are connected to the first connecting seat (123) through a connector (13), and the first connecting seat (123) is also connected to the middle beam module (122) through the connector (13).

10. The longitudinal beam of the railway flatcar according to claim 5, characterized in that, The lower beam (12) also includes a second connecting seat (124), which is located on the lateral outer side of the first side beam (121b). The second connecting seat (124) is connected to the first side beam (121b) through a connector (13), and the second connecting seat (124) is connected to the middle beam module (122) through the connector (13).

11. The longitudinal beam of the railway flatcar according to any one of claims 1-4, characterized in that, The middle beam module (122) includes two second side beams (122a) and a plurality of third reinforcing seats (122b). Each of the third reinforcing seats (122b) is connected to the two second side beams (122a) through a connector (13). The two second side beams (122a) are connected to the upper beam body (11) through a connector (13).

12. The longitudinal beam of the railway flatcar according to claim 11, characterized in that, The second side beam (122a) is U-shaped and includes an upper side plate (122a-1), a lower side plate (122a-2), and a side upright plate (122a-3). The side upright plate (122a-3) connects the upper side plate (122a-1) and the lower side plate (122a-2). The upper side plate (122a-1) is connected to the upper beam body (11) through a connector (13), and the lower side plate (122a-2) is connected to the end beam module (121) through a connector (13).

13. The longitudinal beam of the railway flatcar according to any one of claims 1-4, characterized in that, The connector (13) is a bolt or a rivet.

14. A railway flatcar body, comprising longitudinal beams, characterized in that, The longitudinal beam is the longitudinal beam of the railway flatcar as described in any one of claims 1-13.

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