Beam assembly for lightweight bridge

Abstract

The utility model provides a light-weight bridge crossbeam assembly which comprises a crossbeam, a first support, a second support, a first reinforcing piece and a second reinforcing piece, the crossbeam is provided with a first end and a second end which are oppositely arranged in the first direction, the first end of the crossbeam is detachably connected with the bottom of the first support, and the second end of the crossbeam is detachably connected with the bottom of the second support. The first end of the beam is detachably connected with the bottom of the first support, the second end of the beam is detachably connected with the bottom of the second support, the first reinforcing piece is detachably connected with the top of the first support, the second reinforcing piece is detachably connected with the top of the second support, the first reinforcing piece comprises a first transverse plate extending in the first direction, and the second reinforcing piece comprises a second transverse plate extending in the first direction. A plurality of first lightening holes are formed in the cross beam, a plurality of second lightening holes are formed in the first support and the second support, and a plurality of third lightening holes are formed in the first reinforcing piece and the second reinforcing piece. The beam assembly for the light-weight bridge has the advantages of being high in structural strength, light in weight and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of frame crossbeam, especially relates to a lightweight bridge crossbeam assembly. BACKGROUND

[0002] In modern engineering applications, especially in heavy off-road vehicles and large mechanical equipment, the crossbeam as a key structural component, its performance is directly related to the stability and reliability of the whole system.

[0003] The traditional crossbeam design has many problems, which limits its use in high-performance application scenarios, the overall quality of the existing crossbeam is large, which cannot effectively reduce the weight of the vehicle, affecting the lightweight design of the whole vehicle, and further negatively affecting fuel economy, maneuverability and transportation efficiency. SUMMARY

[0004] The utility model provides a lightweight bridge crossbeam assembly to solve the defect that the crossbeam is heavy in prior art, realize the lightweight of crossbeam.

[0005] The utility model provides a lightweight bridge crossbeam assembly, comprising:

[0006] The crossbeam has a first end and a second end arranged oppositely in a first direction;

[0007] The first support and the second support are detachably connected to the bottom of the first support and the bottom of the second support respectively;

[0008] The first reinforcing member and the second reinforcing member are detachably connected to the top of the first support and the top of the second support respectively, the first reinforcing member comprises a first transverse plate extending in the first direction, the second reinforcing member comprises a second transverse plate extending in the first direction, and the first transverse plate and the second transverse plate extend oppositely;

[0009] A plurality of first weight reduction holes are arranged on the crossbeam, a plurality of second weight reduction holes are arranged on the first support and the second support, and a plurality of third weight reduction holes are arranged on the first reinforcing member and the second reinforcing member.

[0010] In some embodiments, in a second direction, the size of the first reinforcing member and the second reinforcing member is L, the size of the first support and the second support is M, and the second direction is perpendicular to the first direction, wherein L is greater than or equal to M.

[0011] In some embodiments, one side of the first support adjacent to the second support in the first direction is a first end surface, the first reinforcing member comprises a first longitudinal plate, the first transverse plate is connected to a top end of the first longitudinal plate, the first longitudinal plate is attached to the first end surface, and a top surface of the first transverse plate is flush with a top surface of the first support.

[0012] In some embodiments, one side of the second support adjacent to the first support in the first direction is a second end surface, the second reinforcing member comprises a second longitudinal plate, the second transverse plate is connected to a top end of the second longitudinal plate, the second longitudinal plate is attached to the second end surface, and a top surface of the second transverse plate is flush with a top surface of the second support.

[0013] In some embodiments, the cross beam comprises a middle frame and a plurality of connecting portions, the middle frame and each of the connecting portions are annular to define the first weight-reducing hole, a part of the connecting portions are arranged between the middle frame and the first support to connect the middle frame and the first support, and another part of the connecting portions are arranged between the middle frame and the second support to connect the middle frame and the second support.

[0014] Each of the connecting portions comprises a wall plate, a dimension of the wall plate in a third direction is greater than or equal to a thickness dimension of the wall plate, and the third direction is perpendicular to the first direction and the second direction.

[0015] In some embodiments, the connecting portions comprise a first portion, a second portion, a third portion and a fourth portion, the first portion and the third portion are arranged at a first end of the cross beam, the second portion and the fourth portion are arranged at a second end of the cross beam, the third portion and the fourth portion are oppositely arranged in the first direction, the third portion is arranged to be inclined towards a direction away from the first portion, and the fourth portion is arranged to be inclined towards a direction away from the second portion.

[0016] In some embodiments, the cross beam comprises a reinforcing plate, the reinforcing plate is arranged to be spaced apart from the middle frame in the second direction, the reinforcing plate extends along the first direction, one end of the reinforcing plate is connected to the third portion, and another end of the reinforcing plate is connected to the fourth portion.

[0017] In some embodiments, the first support and the second support each comprise a plate body, a first connecting plate and a second connecting plate, the first connecting plate is detachably connected to the cross beam, and the two second connecting plates are respectively detachably connected to the first longitudinal plate and the second longitudinal plate.

[0018] The plate body is provided with a plurality of second lightening holes, the second connecting plate is provided with a plurality of fourth lightening holes, and the first longitudinal plate and the second longitudinal plate are each provided with a plurality of third lightening holes corresponding to the fourth lightening holes.

[0019] In some embodiments, the first support and the second support are each provided with a first hole for a transmission shaft to pass through, and the first hole is substantially hexagonal.

[0020] In some embodiments, the first lightening hole and the second lightening hole are each provided with a reinforcing rib on an inner peripheral wall.

[0021] The first reinforcing member is installed on the top of the first support, which is conducive to increasing the structural strength of the top of the first support. The second reinforcing member is installed on the top of the second support, which is conducive to increasing the structural strength of the top of the second support. Moreover, the first transverse plate and the second transverse plate are arranged to make the top of the lightweight bridge beam assembly have a certain bearing area, thereby forming a frame type structure together with the transverse beam, the first support and the second support, so that the bottom, the top and the two sides of the lightweight bridge beam assembly can bear a certain load, thereby improving the structural strength of the lightweight bridge beam assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0023] Figure 1 is a schematic view of the assembly structure of the lightweight bridge beam assembly and the longitudinal beam provided by the present application.

[0024] Figure 2 is a schematic view of the structure of the lightweight bridge beam assembly provided by the present application.

[0025] Figure 3 is a schematic view of the structure of the transverse beam of the lightweight bridge beam assembly provided by the present application.

[0026] Figure 4 is a schematic view of the structure of the first support of the lightweight bridge beam assembly provided by the present application.

[0027] Figure 5 is a schematic view of the structure of the first reinforcing member or the second reinforcing member of the lightweight bridge beam assembly provided by the present application.

[0028] Figure 6 is a structural schematic view of the first reinforcing member or the second reinforcing member of the lightweight bridge beam assembly in another perspective view.

[0029] Figure 7 is a structural schematic view of the first reinforcing member or the second reinforcing member of the lightweight bridge beam assembly in another perspective view.

[0030] Figure 8 is a structural schematic view of the lightweight bridge beam assembly in another perspective view.

[0031] Reference signs:

[0032] 100, lightweight bridge beam assembly;

[0033] 1, beam; 11, middle frame; 12, connecting part; 121, wall plate; 13, first part; 14, second part; 15, third part; 16, fourth part; 17, reinforcing plate;

[0034] 21, first support; 211, first end face;

[0035] 22, second support; 221, second end face; 23, plate body; 231, first hole; 24, first connecting plate; 25, second connecting plate;

[0036] 31, first reinforcing member; 311, first transverse plate; 312, first longitudinal plate; 32, second reinforcing member; 321, second transverse plate; 322, second longitudinal plate; 41, first weight-reducing hole; 42, second weight-reducing hole; 43, third weight-reducing hole; 5, longitudinal beam. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0038] As Figures 1 to 8 shown, the embodiment of the utility model discloses a kind of lightweight bridge beam assembly 100, including beam 1, first support 21, second support 22, first reinforcing member 31 and second reinforcing member 32.

[0039] Beam 1 has first end and second end oppositely arranged in first direction.

[0040] The first end of the cross beam 1 is detachably connected to the bottom of the first support 21, and the second end of the cross beam 1 is detachably connected to the bottom of the second support 22.

[0041] The first reinforcing member 31 is detachably connected to the top of the first support 21, and the second reinforcing member 32 is detachably connected to the top of the second support 22. The first reinforcing member 31 comprises a first horizontal plate 311 extending in the first direction, the second reinforcing member 32 comprises a second horizontal plate 321 extending in the first direction, and the first horizontal plate 311 and the second horizontal plate 321 extend towards each other.

[0042] The cross beam 1 is provided with a plurality of first weight-reducing holes 41, the first support 21 and the second support 22 are provided with a plurality of second weight-reducing holes 42, and the first reinforcing member 31 and the second reinforcing member 32 are provided with a plurality of third weight-reducing holes 43.

[0043] The lightweight bridge cross beam assembly 100 is suitable for being arranged between two longitudinal beams 5, the first support 21 and the first reinforcing member 31 are suitable for being connected to one longitudinal beam 5, and the second support 22 and the second reinforcing member 32 are suitable for being connected to the other longitudinal beam 5.

[0044] In order to make the technical scheme of the present application easier to be understood, the technical scheme of the present application is further described below taking the first direction consistent with the left-right direction as an example, wherein the left-right direction is as shown in Figure 1 .

[0045] The left end of the cross beam 1 is the first end, and the right end of the cross beam 1 is the second end.

[0046] The left end of the cross beam 1 is connected to the bottom of the first support 21 by bolts, and the right end of the cross beam 1 is connected to the bottom of the second support 22 by bolts.

[0047] The first reinforcing member 31 is connected to the top of the first support 21 by bolts, and the second reinforcing member 32 is connected to the top of the second support 22 by bolts. The first horizontal plate 311 extends to the right, and the second horizontal plate 321 extends to the left.

[0048] When installation is needed, the lightweight bridge cross beam assembly 100 is arranged between two longitudinal beams 5, the left end of the cross beam 1, the first support 21 and the first reinforcing member 31 are connected to the left longitudinal beam 5, and the right end of the cross beam 1, the second support 22 and the second reinforcing member 32 are connected to the right longitudinal beam 5.

[0049] The lightweight bridge beam assembly 100 has the advantages of high structural strength and light weight.

[0050] In addition, the first, second and third lightening holes 41, 42 and 43 are arranged to reduce the weight of the lightweight bridge beam assembly 100 while meeting the strength requirement.

[0051] Therefore, the lightweight bridge beam assembly 100 has the advantages of high structural strength and light weight.

[0052] In some embodiments, in the second direction, the first and second reinforcing members 31 and 32 have a size of L, and the first and second supports 21 and 22 have a size of M, and the second direction is perpendicular to the first direction, wherein L≥M.

[0053] For example, in order to make the technical scheme of the present application easier to understand, the technical scheme of the present application is further described below taking the second direction consistent with the front-back direction as an example, wherein the front-back direction is as shown in the accompanying drawings. Figure 1

[0054] The first and second reinforcing members 31 and 32 have the same size L in the front-back direction, and the first and second supports 21 and 22 have the same size M in the front-back direction, and L≥M.

[0055] L=M, the length of the first reinforcing member 31 in the front-back direction is equal to that of the first support 21, and the length of the second reinforcing member 32 in the front-back direction is also equal to that of the second support 22, ensuring the consistency and symmetry of the structure.

[0056] Therefore, when L>M, the length of the first reinforcing member 31 in the front-back direction exceeds that of the first support 21, and the first reinforcing member 31 has an additional extension part to further enhance the rigidity and deformation resistance of the structure beyond the first support 21. Similarly, the second reinforcing member 32 is also longer than the second support 22 in the front-back direction, providing more extensive protection and support for the lightweight bridge beam assembly 100, and enhancing the stability and durability of the overall structure of the lightweight bridge beam assembly 100.

[0057] ​In some embodiments, the side of the first bracket 21 adjacent to the second bracket 22 in the first direction is the first end face 211, the first reinforcing member 31 includes a first longitudinal plate 312, the first transverse plate 311 is connected to the top of the first longitudinal plate 312, the first longitudinal plate 312 is in contact with the first end face 211, and the top surface of the first transverse plate 311 is flush with the top surface of the first bracket 21.

[0058] For example, such as Figure 2 As shown, the right end face of the first bracket 21 is the first end face 211, and the first reinforcing member 31 includes a first longitudinal plate 312, which is located below the first transverse plate 311.

[0059] The top of the first vertical plate 312 is fixedly connected to the first horizontal plate 311, for example, the two are integrally formed.

[0060] The left end face of the first longitudinal plate 312 is attached to the first end face 211, and then the first longitudinal plate 312 and the first bracket 21 are connected together by bolts.

[0061] The top surface of the first cross plate 311 is flush with the top surface of the first support 21, ensuring that when a load is applied to the top of the lightweight bridge beam assembly 100, the load can be evenly distributed on the first support 21 and the first reinforcing member 31, avoiding local stress concentration, thereby improving the safety and durability of the lightweight bridge beam assembly 100.

[0062] In some embodiments, the side of the second bracket 22 adjacent to the first bracket 21 in the first direction is the second end face 221, the second reinforcing member 32 includes a second longitudinal plate 322, the second transverse plate 321 is connected to the top of the second longitudinal plate 322, the second longitudinal plate 322 is in contact with the second end face 221, and the top surface of the second transverse plate 321 is flush with the top surface of the second bracket 22.

[0063] For example, such as Figure 2 As shown, the left end face of the second bracket 22 is the second end face 221, and the second reinforcing member 32 includes a second longitudinal plate 322, which is located below the second transverse plate 321.

[0064] The top of the second longitudinal plate 322 is fixedly connected to the second transverse plate 321, for example, the two are integrally formed.

[0065] The right end face of the second longitudinal plate 322 is attached to the second end face 221, and then the second longitudinal plate 322 and the second bracket 22 are connected together by bolts.

[0066] The top surface of the second transverse plate 321 is flush with the top surface of the second support 22, which ensures that when a load is applied to the top of the lightweight bridge transverse beam assembly 100, the load can be evenly distributed on the second support 22 and the second reinforcing member 32, avoiding local stress concentration, thereby improving the safety and durability of the lightweight bridge transverse beam assembly 100.

[0067] In some embodiments, as shown in Figure 3 The transverse beam 1 includes a middle frame 11 and a plurality of connecting portions 12, the middle frame 11 and each connecting portion 12 are annular to define a first weight-reducing hole 41, a part of the connecting portions 12 are arranged between the middle frame 11 and the first support 21 to connect the middle frame 11 and the first support 21, and another part of the connecting portions 12 are arranged between the middle frame 11 and the second support 22 to connect the middle frame 11 and the second support 22.

[0068] Each connecting portion 12 includes a wall plate 121, the size of the wall plate 121 in the third direction is greater than or equal to the thickness dimension of the wall plate 121, and the third direction is perpendicular to the first direction and the second direction.

[0069] In order to make the technical solutions of the present application easier to be understood, the technical solutions of the present application are further described below taking the third direction consistent with the up-down direction as an example, wherein the up-down direction is shown in Figure 1 .

[0070] The left side and the right side of the middle frame 11 are provided with connecting portions 12, the plurality of connecting portions 12 on the left side are arranged in the front-rear direction, the plurality of connecting portions 12 on the right side are arranged in the front-rear direction, and the middle frame 11 and each connecting portion 12 are annular to ensure structural strength while facilitating weight reduction.

[0071] The wall plate 121 is a thin plate and a vertical plate, and the thickness of the wall plate 121 is substantially the same at different positions. The size of the wall plate 121 in the up-down direction is the height of the wall plate 121, and the height of the wall plate 121 is designed as needed, for example, the height of the wall plate 121 of the connecting portion 12 on the left side of the middle frame 11 gradually increases from right to left. The height of the wall plate 121 of the connecting portion 12 on the right side of the middle frame 11 gradually increases from left to right.

[0072] Optionally, the plurality of connecting portions 12 and the middle frame 11 are integrally formed and casted.

[0073] In some embodiments, the connecting portion 12 includes a first portion 13, a second portion 14, a third portion 15, and a fourth portion 16, the first portion 13 and the third portion 15 are arranged at the first end of the transverse beam 1, and the second portion 14 and the fourth portion 16 are arranged at the second end of the transverse beam 1.

[0074] The third part 15 and the fourth part 16 are arranged opposite each other in the first direction, with the third part 15 tilted away from the first part 13 and the fourth part 16 tilted away from the second part 14.

[0075] For example, such as Figure 3 As shown, the first part 13 and the third part 15 are located on the left side of the middle frame 11, and the second part 14 and the fourth part 16 are located on the right side of the middle frame 11. The first part 13 and the second part 14 are arranged opposite each other in the left-right direction, and the third part 15 and the fourth part 16 are arranged opposite each other in the left-right direction. The third part 15 extends obliquely to the left front, and the fourth part 16 extends obliquely to the right front.

[0076] In some embodiments, the crossbeam 1 includes a reinforcing plate 17, which is arranged at a distance from the middle frame 11 in a second direction. The reinforcing plate 17 extends along a first direction, with one end of the reinforcing plate 17 connected to the third part 15 and the other end of the reinforcing plate 17 connected to the fourth part 16.

[0077] For example, such as Figure 3 As shown, the reinforcing plate 17 and the middle frame 11 are arranged at intervals in the front-to-back direction, and the reinforcing plate 17 extends in the left-to-right direction. The left end of the reinforcing plate 17 is fixedly connected to the third part 15, and the right end of the reinforcing plate 17 is connected to the fourth part 16. Thus, the reinforcing plate 17 provides additional support and enhances the structural strength of the lightweight bridge beam assembly 100.

[0078] Optionally, the reinforcing plate 17, the middle frame 11, and the multiple connecting parts 12 are integrally formed and cast.

[0079] In some embodiments, the first bracket 21 and the second bracket 22 each include a plate 23, a first connecting plate 24 and a second connecting plate 25. The first connecting plate 24 is detachably connected to the crossbeam 1, and the two second connecting plates 25 are detachably connected to the first longitudinal plate 312 and the second longitudinal plate 322, respectively.

[0080] The plate 23 is provided with multiple second weight reduction holes 42, the second connecting plate 25 is provided with multiple fourth weight reduction holes, and the first longitudinal plate 312 and the second longitudinal plate 322 are each provided with multiple third weight reduction holes 43, with each of the multiple third weight reduction holes 43 corresponding to the multiple fourth weight reduction holes.

[0081] For example, such as Figure 4 As shown, the first connecting plate 24, the plate body 23, and the second connecting plate 25 are arranged sequentially from bottom to top, and the first connecting plate 24, the plate body 23, and the second connecting plate 25 are integrally formed.

[0082] The first connecting plate 24 is a short plate, and multiple plates can be set in the front-to-back direction as needed. The first connecting plate 24 is connected to the connecting part 12 of the crossbeam 1 by bolts.

[0083] Multiple second weight-reducing holes 42 are provided on the plate 23 according to design requirements, which helps to reduce the weight of the plate 23, and in turn helps to reduce the weight of the first support 21 and the second support 22.

[0084] The second connecting plate 25 is connected to the first longitudinal plate 312 or the second longitudinal plate 322. The second connecting plate 25 is provided with a plurality of fourth weight-reducing holes, which helps to reduce the weight of the second connecting plate 25, and in turn helps to reduce the weight of the first bracket 21 and the second bracket 22.

[0085] Multiple third weight-reducing holes 43 are provided on both the first longitudinal plate 312 and the second longitudinal plate 322, which helps to reduce the weight of the first reinforcing member 31 and the second reinforcing member 32.

[0086] Multiple third weight-reducing holes 43 correspond one-to-one with multiple fourth weight-reducing holes. This facilitates the installation of the second connecting plate 25 and the first longitudinal plate 312, or facilitates the installation of the second connecting plate 25 and the second longitudinal plate 322.

[0087] In some embodiments, both the first bracket 21 and the second bracket 22 are provided with a first hole 231 for the drive shaft to pass through, and the first hole 231 is generally hexagonal.

[0088] For example, such as Figure 4 As shown, the plate 23 is provided with a first hole 231, which is matched with the drive shaft. The first hole 231 is a hexagonal irregular hole. Compared with a circular hole, when installing a drive shaft of the same diameter, the area of ​​the hexagonal hole is larger than that of the circular hole, thereby minimizing the weight of the first bracket 21 or the second bracket 22.

[0089] In some embodiments, reinforcing ribs are provided on the inner peripheral walls of the first weight-reducing hole 41 and the second weight-reducing hole 42.

[0090] For example, such as Figure 2 As shown, the reinforcing ribs increase the thickness and rigidity of the inner walls of the first weight-reducing hole 41 and the second weight-reducing hole 42, preventing deformation or cracking when subjected to external loads or impacts, thereby improving the structural strength of the lightweight bridge beam assembly 100.

[0091] The lightweight bridge beam assembly 100 of this utility model embodiment reduces the weight of the bridge beam assembly 100 by providing a first weight reduction hole 41, a second weight reduction hole 42, a third weight reduction hole 43 and a fourth weight reduction hole, thereby achieving a lightweight design of the beam assembly.

[0092] Furthermore, the lightweight bridge beam assembly 100 of this utility model embodiment is made by casting, which can achieve lightweighting while ensuring the structural strength of the lightweight bridge beam assembly 100.

[0093] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lightweight bridge beam assembly, comprising: The utility model relates to a kind of frame, including: Beam, the beam has the first end and the second end oppositely arranged in the first direction; First support and second support, the first end of the beam is detachably connected with the bottom of the first support, the second end of the beam is detachably connected with the bottom of the second support; First reinforcement and second reinforcement, the top of the first support is detachably connected with the first reinforcement, the top of the second support is detachably connected with the second reinforcement, the first reinforcement includes the first transverse plate extending in the first direction, the second reinforcement includes the second transverse plate extending in the first direction, and the first transverse plate and the second transverse plate extend oppositely; A plurality of first weight-reducing holes are provided on the beam, a plurality of second weight-reducing holes are provided on the first support and the second support, and a plurality of third weight-reducing holes are provided on the first reinforcement and the second reinforcement.

2. The lightweight bridge beam assembly of claim 1, wherein, In the second direction, the size of the first reinforcement and the second reinforcement is L, and the size of the first support and the second support is M, the second direction is perpendicular to the first direction, wherein L≥M.

3. The lightweight bridge beam assembly of claim 2, wherein, In the first direction, the side of the first support adjacent to the second support is the first end surface, the first reinforcement includes the first longitudinal plate, the top end of the first longitudinal plate is connected with the first transverse plate, the first longitudinal plate is attached to the first end surface, and the top surface of the first transverse plate is flush with the top surface of the first support.

4. The lightweight bridge beam assembly of claim 3, wherein, In the first direction, the side of the second support adjacent to the first support is the second end surface, the second reinforcement includes the second longitudinal plate, the top end of the second longitudinal plate is connected with the second transverse plate, the second longitudinal plate is attached to the second end surface, and the top surface of the second transverse plate is flush with the top surface of the second support.

5. The lightweight bridge beam assembly of any one of claims 2-4, wherein, The beam includes a middle frame and a plurality of connecting portions, the middle frame and each connecting portion are annular to define the first weight-reducing hole, a part of the connecting portions are arranged between the middle frame and the first support to connect the middle frame and the first support, and another part of the connecting portions are arranged between the middle frame and the second support to connect the middle frame and the second support. Each connecting portion includes a wall plate, the size of the wall plate in the third direction is greater than or equal to the thickness of the wall plate, and the third direction is perpendicular to the first direction and the second direction.

6. The lightweight bridge beam assembly of claim 5, wherein, The connecting portion includes a first portion, a second portion, a third portion and a fourth portion, the first portion and the third portion are arranged at the first end of the beam, the second portion and the fourth portion are arranged at the second end of the beam, the third portion and the fourth portion are oppositely arranged in the first direction, the third portion is arranged obliquely towards the direction away from the first portion, and the fourth portion is arranged obliquely towards the direction away from the second portion.

7. The lightweight bridge beam assembly of claim 6, wherein, The beam includes a reinforcing plate, the reinforcing plate is arranged spaced apart from the middle frame in the second direction, the reinforcing plate extends along the first direction, one end of the reinforcing plate is connected with the third portion, and the other end of the reinforcing plate is connected with the fourth portion.

8. The lightweight bridge beam assembly of claim 4, wherein, The first support and the second support each comprise a plate body, a first connecting plate and a second connecting plate, the first connecting plate is detachably connected with the cross beam, and two second connecting plates are respectively detachably connected with the first longitudinal plate and the second longitudinal plate; A plurality of second weight reduction holes are arranged on the plate body, a plurality of fourth weight reduction holes are arranged on the second connecting plate, and a plurality of third weight reduction holes are arranged on the first longitudinal plate and the second longitudinal plate, and the plurality of third weight reduction holes and the plurality of fourth weight reduction holes correspond one by one.

9. The lightweight bridge beam assembly of claim 1, wherein, First holes are arranged on the first support and the second support, the first holes are for the transmission shaft to pass through, and the first holes are generally hexagonal.

10. The lightweight bridge beam assembly of claim 1, wherein, A reinforcing rib is arranged on the inner circumferential wall of the first weight reduction hole and the second weight reduction hole.

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