CN211417423U - Assembled lightweight boxcar with reinforced floor module - Google Patents

Abstract

The utility model discloses a lightweight boxcar with a reinforced bottom plate module assembly, which comprises a front boxcar plate, a rear boxcar door, two symmetrically arranged side boxcar plates, a boxcar bottom plate and a boxcar top plate, wherein one side boxcar plate is provided with a side boxcar door; the side carriage plate comprises a side plate body, and a first side beam wrapping block and a second side beam wrapping block are respectively arranged on the upper side edge and the lower side edge of the side plate body; the platform floor comprises a bottom plate side beam, a bottom plate cross beam and a bottom plate longitudinal beam, wherein the bottom plate cross beam and the bottom plate longitudinal beam are connected within the bottom plate side beam, the bottom plate longitudinal beam and the bottom plate cross beam are connected to form a rectangular frame structure, a first bottom plate body and a second bottom plate body are arranged above the bottom plate cross beam and the bottom plate longitudinal beam, and a reinforcing beam is integrally extruded and formed at the bottom of the first bottom plate body by adopting an aluminum alloy material. The remarkable effects are as follows: and the carriage is assembled in a modularization way, so that the carriage has high structural strength and good deformation resistance.

Description

Assembled lightweight boxcar with reinforced floor module

Technical Field

The utility model relates to tipper lightweight carriage technical field, concretely relates to lightweight boxcar with strengthen bottom plate module assembled.

Background

According to the relevant national policies, the overload needs to be strongly managed, and the total weight of the vehicle is controlled by matching with the implementation of a weighing and charging system. In addition, the commercial vehicle has a tendency to be light in weight due to the consideration of energy saving, environmental protection and safety of the vehicle. Further, the advantages of high efficiency, energy saving, environmental protection and safety of the lightweight vehicle are gradually emphasized by users, and thus, the market expansion and the user demand increase are also driving forces for the lightweight vehicle.

However, most of the domestic compartments are of composite and corrugated board structures at present. But all have the defects of heavy weight of the carriage, poor sealing and waterproof performance and the like. Accordingly, there has been proposed a freight car body of an aluminum structure, in which although energy can be saved, if the structure of the prior art is adopted, the longer the car body is, the weaker the strength and rigidity of the car body structure is, and the bearing capacity is remarkably reduced, so that it is an effective way to increase the rigidity to meet the geometric size of the car body. However, in the traditional process, the rigidity of the aluminum platform floor is enhanced by welding a reinforcing beam at the bottom of the floor, but the welding process generates heat, the strength of the base material is lost, and the integral strength of the platform floor is poor. Meanwhile, the connection mode between the side plate and the side beam in the side plate of the existing aluminum carriage is that the side plate and the side beam are welded and fixed on the surface of the cross beam, and a transverse tearing force is formed at the moment; this makes the shear resistance and deformation resistance of the side deck panel insufficient.

Disclosure of Invention

The utility model aims at providing a not enough to prior art, the utility model aims at providing a lightweight boxcar with strengthen bottom plate module assembled, this carriage structure adopts the modularization assembly, and carriage structural strength is high, can resist great goods impact force, and anti deformability is good.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a lightweight boxcar with strengthen floor module assembled which the key lies in: the automobile rear compartment door comprises a front compartment plate, a rear compartment door, two symmetrically arranged side compartment plates, a compartment bottom plate and a compartment top plate, wherein the front compartment plate, the rear compartment door, the two symmetrically arranged side compartment plates, the compartment bottom plate and the compartment top plate enclose a rectangular compartment body;

the side carriage plate comprises a side plate body, wherein a first side beam wrapping block and a second side beam wrapping block are respectively arranged at the edges of the upper side edge and the lower side edge of the side plate body, the first side beam wrapping block and the second side beam wrapping block are respectively used for being fixedly connected with the side edges of a carriage top plate and a carriage bottom plate, profiling grooves matched with the side plate body are respectively formed in the first side beam wrapping block and the second side beam wrapping block, the upper side and the lower side of the side plate body are inserted into the profiling grooves and extend outwards to form a part, and the extending part of the side plate body is welded and fixed with the first side beam wrapping block and the second side beam wrapping block;

the platform floor comprises a bottom plate side beam, a bottom plate cross beam and a bottom plate longitudinal beam, wherein the bottom plate cross beam and the bottom plate longitudinal beam are connected within the bottom plate side beam, the bottom plate longitudinal beam and the bottom plate cross beam are connected to form a rectangular frame structure, a first bottom plate body and a second bottom plate body are arranged above the bottom plate cross beam and the bottom plate longitudinal beam, the bottom of the first bottom plate body is made of an aluminum alloy material in an integrated extrusion forming mode to form a reinforcing beam, the reinforcing beam is arranged in parallel with the bottom plate cross beam, a plurality of second bottom plate bodies are arranged between every two adjacent first bottom plate bodies, and the first bottom plate bodies and the second bottom plate bodies and the adjacent second bottom plate bodies are fixedly connected through friction welding.

Further, the first bottom plate body and the reinforcing beam are in a T-shaped structure in cross section, wherein the first bottom plate body forms a transverse part of the T-shaped structure, and the reinforcing beam forms a vertical part of the T-shaped structure.

Furthermore, the first bottom plate body and the second bottom plate body are of double-layer aluminum plate structures, and supporting walls are formed between the double-layer aluminum plates.

Furthermore, the first bottom plate body and the second bottom plate body both adopt a multi-cavity structure.

Furthermore, the notch is in an inverted T shape, the longitudinal part of the notch is matched with the bottom plate longitudinal beam above the flange, the bottom plate longitudinal beam below the flange protrudes out of the lower surface of the reinforcing cross beam, and the transverse part of the notch is matched with the flange.

Furthermore, offer on the flange with the breach transverse part is adapted and is stepped down the groove, works as the bottom plate longeron card is located in the breach, the inner wall in groove of stepping down with the inner wall of breach transverse part contacts.

Furthermore, the bottom plate longitudinal beam and the flange are integrally extruded and formed by aluminum alloy, and the bottom plate longitudinal beam is of a multi-cavity structure.

Further, the first side beam wrapping block comprises a vertical portion, and a first transverse portion and a second transverse portion which are connected to the vertical portion, wherein the first transverse portion is connected to the top of the vertical portion, the second transverse portion is connected to the middle lower portion of the vertical portion, a buckling groove is formed between the first transverse portion and the second transverse portion, the buckling groove is buckled on the side edge of the carriage top plate, the first side beam wrapping block and the carriage top plate are buckled and then welded and fixed, the second transverse portion is provided with the profiling groove, and the extending portion of the side plate body is welded to one side, close to the first transverse portion, of the second transverse portion.

Further, second boundary beam package piece includes buckling parts and protection part, the buckling parts is used for the lock to be in bottom plate's side reason, welded fastening behind side carriage board and the bottom plate lock forms between buckling parts and the protection part the profile groove, the protruding part of curb plate body weld in the lower lateral wall of buckling parts, protection part locate in the carriage and support in on the protruding portion of bottom plate boundary beam for the offside carriage board provides the impact force protection.

Furthermore, the protection part comprises a plane part and an inclined part which are connected, the plane part is supported on the carriage bottom plate, the inclined part extends to the side carriage plate from the inner side of the plane part, a support strip is arranged between the inclined part and the side carriage plate, the free end of the support strip extends to be in contact with the side carriage plate, and the upper side edge of the inclined part is partially welded with the side carriage plate.

The utility model discloses a show the effect and be:

1. the side beam wrapping blocks are added on the upper side and the lower side of the side carriage plate and the front carriage plate, so that the side plates are more simply and conveniently sprayed; meanwhile, the carriage is divided into seven large plates by using the structure, so that the transportation is more convenient, the transportation difficulty is reduced, the transportation quantity of each vehicle is increased, the transportation quantity of the existing whole vehicle can be increased by 5 times, simultaneously, each module is transported to a client site to realize the assembly in different places, and the modes of internal welding and external riveting are adopted during the assembly, so that the production efficiency is improved, and the product quality is ensured;

2. the side carriage plate is welded and fixed with the edge beam wrapping block in the vertical direction through the profiling groove arranged on the edge beam wrapping block instead of welding the side plate on the surface of the edge beam of the side plate in the traditional technology, so that the transverse shearing force of the welded side plate body in the traditional structure is changed into the longitudinal pulling force, the deformation resistance of the side carriage plate is improved, and the service life of a carriage is prolonged;

3. the platform floor structure integrally formed by extrusion and provided with the stiffening beam is adopted, the weakening of base metal during welding is avoided, and the overall strength of the platform floor is improved.

Drawings

Fig. 1 is a schematic view of the structure of a viewing angle of the present invention;

fig. 2 is a schematic structural view of another view angle of the present invention;

fig. 3 is a front view of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is an enlarged partial schematic view of D of FIG. 4;

FIG. 6 is an enlarged partial schematic view of E in FIG. 4;

fig. 7 is a left side view of the present invention;

FIG. 8 is a cross-sectional view B-B of FIG. 7;

FIG. 9 is an enlarged partial schematic view of center F of FIG. 8;

FIG. 10 is an enlarged partial schematic view of section G of FIG. 8;

FIG. 11 is an enlarged partial schematic view of section H of FIG. 8;

FIG. 12 is a schematic enlarged partial view of section I in FIG. 11;

FIG. 13 is a cross-sectional view C-C of FIG. 7;

FIG. 14 is an enlarged partial schematic view of K of FIG. 13;

FIG. 15 is an enlarged partial schematic view of middle J of FIG. 13;

fig. 16 is a bottom view of the present invention;

FIG. 17 is a schematic view showing a state where the reinforcing beam is connected to the floor side member;

FIG. 18 is an exploded view of FIG. 16;

FIG. 19 is a schematic view of the reinforcement beam at the notch;

FIG. 20 is a cross-sectional schematic view of the floor stringer.

Detailed Description

The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.

As shown in fig. 1 to 20, the light-weight wagon compartment with the reinforced bottom plate module assembly described in this embodiment includes a front wagon plate 1, a rear wagon door 2, two side wagon plates 3 symmetrically arranged, a wagon bottom plate 4, and a wagon top plate 5 made of aluminum, the front wagon plate 1, the rear wagon door 2, the two side wagon plates 3 symmetrically arranged, the wagon bottom plate 4, and the wagon top plate 5 enclose a rectangular wagon body, a side wagon door 6 is provided on one of the side wagon plates 3, the rear wagon door 2 and the side wagon door 6 are both hinged to the side wagon plates 3 through hinges, and the carriage can be sealed through a locking mechanism. The rear compartment door 2 is designed as a split double door, one side of each door leaf is hinged with the edge beam of the side compartment plate 3 through a hinge, the other side of each door leaf is arranged in the middle of the compartment, and the compartment can be sealed through a locking mechanism. The installation structure of the side compartment door 6 is similar to that of the rear compartment door 2, namely, one side of the side compartment door is hinged with the side compartment door 3 through a hinge, and the other side of the side compartment door is relatively fixed with the side compartment plate 3 through a locking structure.

Regarding the front deck 1 and the side deck 3:

the front compartment plate 1 and the side compartment plate 3 have similar structures, and in this embodiment, the side compartment plate 3 is taken as an example for specific description. The connection between the front carriage plate 1 and the side carriage plate 3 is realized through the upright post 7, two sides of the upright post are respectively provided with a step, the front carriage plate 1 and the side carriage plate 3 are respectively supported on one of the steps and then are fixed by welding.

With respect to the side compartment panel 3:

the side car body plate 3 comprises a wave-shaped side plate body 31, a first side beam wrapping block 32 and a second side beam wrapping block 33 are respectively arranged on the upper side edge and the lower side edge of the side plate body 31, the first side beam wrapping block 32 and the second side beam wrapping block 33 are used for being fixedly connected with the side edge of the car bottom plate 4 or the car top plate 5, the first side beam wrapping block 32 and the second side beam wrapping block 33 are respectively provided with a contour groove matched with the side plate body, the upper side and the lower side of the side plate body 31 are inserted into the contour grooves and extend outwards to form a part, and the extending part s of the side plate body 31 is welded and fixed with the first side beam wrapping block 32 and the second side beam wrapping block 33;

in the traditional technology, the connection mode between the side plates and the edge beams is that the side plates and the edge beams are welded and fixed on the surface of a cross beam, and a transverse tearing force is formed at the moment; in this embodiment, the protruding portion s of the side plate body 31 is welded and fixed to the upper side wall of the first side sill packet 32 and the lower side wall of the second side sill packet 33 through a contour groove provided in correspondence with the side plate body 31; the transverse tearing tension between the side plate and the edge beam wrapping block is changed into the longitudinal tension, and the deformation resistance of the carriage is improved.

With respect to the first side rail package block 32:

the first side sill packet 32 includes a vertical portion 321, and a first transverse portion 322 and a second transverse portion 323 connected to the vertical portion 321, wherein the first transverse portion 322 is connected to the top of the vertical portion 321, the second transverse portion 323 is connected to the middle lower portion of the vertical portion 321, a fastening groove is formed between the first transverse portion 322 and the second transverse portion 323, the fastening groove is fastened to the side edge of the car roof panel 5, the first side sill packet 32 is fastened to the car roof panel 5 and then welded and fixed, the second transverse portion is provided with the pseudo-groove, and the extension s of the side panel body 31 is welded to the side of the second transverse portion 323 close to the first transverse portion 322.

With respect to the second side sill packet 33:

the second boundary beam 33 package piece includes buckling parts 331 and protection parts 332, buckling parts 331 are used for buckling the side edge of the platform floor 4, after the side platform board 3 and the platform floor 4 are buckled, the inner side edge of the second boundary beam package piece 33 is welded and fixed with the bottom plate boundary beam 407 of the platform floor 4, and the protection parts 331 are riveted and fixed with the bottom plate boundary beam 407 through rivets. The curved groove is formed between the buckling portion 331 and the protection portion 332, the extending portion s of the side plate body 31 is welded to the lower side walls of the buckling portion 331 and the protection portion 332, and the protection portion 332 is disposed in the vehicle compartment and supported on the protruding portion 407b of the bottom plate side beam 407, so as to provide impact protection for the side compartment panel 3.

Further, the protection portion 332 includes a plane portion 332a and a slope portion 332b connected to each other, the plane portion 332a is supported on the platform floor 4, the slope portion 332b extends from the inner side of the plane portion 332a to the side platform panel 3, a support strip 332c is disposed between the slope portion 332b and the side platform panel 3, a free end of the support strip 332c extends to contact with the side platform panel 3 and is formed with a contact head 332d, and an upper side edge of the slope portion 332b is partially welded to the side platform panel 3, that is, only a portion of the corrugated side panel body 31 close to the slope portion 332b is welded, so that not only is the welding workload reduced, but also the side platform panel 3 is protected against impact force, and the side platform panel 3 is prevented from being deformed due to local stress when a cargo impacts.

In the embodiment, the side beam wrapping blocks are added on the upper side and the lower side of the side carriage plate 3 and the front carriage plate 1, so that the side plates are more simply and conveniently sprayed; utilize this structure to divide the carriage into seven big plates simultaneously, make the transportation more convenient, reduced the transportation degree of difficulty and increaseed every car transportation volume, the triangle-shaped protection part in the second boundary beam package piece 33 is protection portion 332 promptly simultaneously, has effectively avoided the local atress of preceding carriage board 1 and side carriage board 3 when the goods assaults, makes its anti deformability obtain the reinforcing, effectively avoids the infiltration phenomenon that the carriage warp to appear simultaneously.

With respect to the floor 4:

referring to fig. 10 to 16, in this example, the floor 4 includes floor side members 407 and cross-connected floor longitudinal members 401 and floor cross members 402 connected to the inside of the floor side members 407, the floor stringers 401, floor cross-beams 402 and floor edge beams 407 form a rectangular frame structure (in other embodiments, other polygons, etc.), wherein the longitudinal beams 401 of the bottom plate are arranged along the length direction of the carriage, a first bottom plate body 403 and a second bottom plate body 404 are laid on the rectangular frame type structure, a reinforcing beam 405 is integrally extruded and formed on the bottom of the first bottom plate body 403 by adopting an aluminum alloy material, the reinforcing beam 405 is disposed in parallel with the floor cross member 402, a plurality of second floor bodies 404 are disposed between two adjacent first floor bodies 403, the first bottom plate body 403 and the second bottom plate body 404 and two adjacent second bottom plate bodies 404 are fixedly connected by friction welding. It is understood that in other embodiments, the second floor bodies 404 disposed between the first floor bodies 403 may be any number between 0 and N, that is, if the load capacity of the car is large, the reinforcing beams 405 are disposed more densely, the car floor 4 may be formed by sequentially splicing the first floor bodies 403, and if the load capacity is small, the disposing distance of the reinforcing beams 405 is increased, so that the second floor bodies 404 are unnecessary components.

In the prior art, the stiffening beam 405 and the platform floor 4 are welded, the stiffening beam 405 and the platform floor 4 are integrally extruded and formed, so that the base metal is prevented from being weakened after welding, and meanwhile, the process steps are reduced and the production cost is reduced by adopting the production mode of integrally extruded and formed.

Because the deformation resistance of the double-layer aluminum plate structure is greater than that of the single-layer steel plate when the same volume of raw materials is used, the first bottom plate body 403 and the second bottom plate body 404 both adopt the double-layer aluminum plate structure, so that the deformation resistance of the platform floor 4 is enhanced.

With respect to the floor edge beam 407:

in this example, a supporting step 407a is formed on the inner side of the bottom side rail 407, the supporting step 407a is used to support the first bottom plate 403 and the second bottom plate 404, a protruding portion 407b is formed on the middle portion of the bottom side rail 407 in an upward extending manner, a protruding edge 407c is formed on the outer side of the bottom side rail 407 in an upward extending manner, a water overflow groove 407d is formed between the protruding portion 407b and the protruding edge 407c, and the protruding portion of the side plate body 31 is received in the water overflow groove 407 d.

Through the overflow tank 407d that sets up on the bottom plate boundary beam 407, appear fatigue loss or welding process not tight and when arousing the infiltration problem in front carriage board 1 or side carriage board 3, can effectively discharge water, avoid it to flow into the carriage and damage the goods, guaranteed the security in the freight transportation process effectively.

With respect to floor stringer 401:

two sides of the lower part of the bottom plate longitudinal beam 401 extend outwards to form flanges 401a respectively; the bottom plate longitudinal beam 401 and the flange 401a are integrally formed by extrusion of aluminum alloy, and the bottom plate longitudinal beam 401 is of a multi-cavity structure so as to enhance the deformation resistance.

Further, the floor longitudinal beam 401 has four cavities, the height of the cavities on both sides of the upper side is greater than that of the cavities on the lower side, and the separation of the cavities on both sides of the upper side and the lower side is adapted to the formation position of the flange 401 a. It will be appreciated that the floor stringers 401 may have other numbers of cavities and that the flanges 401a may be correspondingly formed in other locations.

Regarding the connection between floor longitudinal beams 401 and floor transverse beams 402 or reinforcing beams 405:

in this example, the connection modes between the floor longitudinal beams 401 and the floor cross beams 402 and between the floor longitudinal beams 401 and the reinforcing beams 405 are the same, and the connection mode between the floor longitudinal beams 401 and the reinforcing beams 405 is described as an example, and the specific connection structure is as follows:

the reinforcing beam 405 is provided with a notch 406 corresponding to the floor longitudinal beam 401, the notch 406 is approximately in an inverted T shape, the longitudinal part of the notch 406 is corresponding to the floor longitudinal beam 401 above the flange 401a, the floor longitudinal beam 401 below the flange 401a is arranged by protruding out of the lower surface of the reinforcing beam 405, the transverse part of the notch 406 is corresponding to the flange 401a, when the floor longitudinal beam 401 is clamped in the notch 406 arranged on the reinforcing beam 405, the lower surface of the reinforcing beam 405 is flush with the lower surface of the flange 401a, and therefore the requirement of large plane required by friction welding is met. Therefore, the lower surface of the reinforcing beam 405 and the lower surface of the flange 401a are welded and fixed by friction welding, and the rest contact part of the reinforcing beam 405 and the floor longitudinal beam 401 is welded and fixed by argon arc welding.

Adopt argon arc welding between traditional bottom plate longeron 401 and the bottom plate crossbeam 402, the not enough department of intensity adds the triangle piece reinforcement, and construction process is complicated, and the welding is heated can change material strength, and joint strength is limited. In the embodiment, the first bottom plate body 403 with the reinforcing beam 405 and the bottom plate longitudinal beam 401 with the flange 401a which are integrally extruded are structurally clamped, and the friction welding part is added, so that the overall strength of the bottom plate is enhanced, and the influence of heat of the traditional welding mode on the strength of the base material is reduced.

Preferably, the flange 401a is provided with a yielding groove 401b corresponding to the transverse part of the notch 406, and when the bottom plate longitudinal beam 401 is clamped in the notch 406, the inner wall of the yielding groove 401b is in contact with the inner wall of the transverse part of the notch 406, so that friction welding is facilitated.

It will be appreciated that the attachment of the reinforcement beam 405 to the floor rail 402 is not limited to the floor 4, and other frame-type attachments, such as those that require cross-and-rail attachment, may be used.

According to the scheme, the side beam wrapping blocks are additionally arranged on the upper side and the lower side of the side carriage plate 3 and the front carriage plate 1, so that the side plates are more simply and conveniently sprayed; utilize this structure to divide the carriage into seven big plates simultaneously, make the transportation more convenient, reduced the transportation degree of difficulty and increaseed every car transportation volume, the triangle-shaped protection part in the second boundary beam package piece 33 is protection portion 332 promptly simultaneously, has effectively avoided the local atress of preceding carriage board 1 and side carriage board 3 when the goods assaults, makes its anti deformability obtain the reinforcing, effectively avoids the infiltration phenomenon that the carriage warp to appear simultaneously. In addition, through the bottom plate reinforcing structure, the deformation resistance and the impact resistance of the carriage floor are effectively enhanced, the overall strength of the bottom plate structure is effectively enhanced, and the strength and the rigidity of the carriage are further ensured.

The technical scheme provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (7)

1. The utility model provides a lightweight boxcar with strengthen bottom plate module assembled which characterized in that: the automobile rear compartment door comprises a front compartment plate, a rear compartment door, two symmetrically arranged side compartment plates, a compartment bottom plate and a compartment top plate, wherein the front compartment plate, the rear compartment door, the two symmetrically arranged side compartment plates, the compartment bottom plate and the compartment top plate enclose a rectangular compartment body;

the side carriage plate comprises a side plate body, wherein a first side beam wrapping block and a second side beam wrapping block are respectively arranged at the edges of the upper side edge and the lower side edge of the side plate body, the first side beam wrapping block and the second side beam wrapping block are respectively used for being fixedly connected with the side edges of a carriage top plate and a carriage bottom plate, profiling grooves matched with the side plate body are respectively formed in the first side beam wrapping block and the second side beam wrapping block, the upper side and the lower side of the side plate body are inserted into the profiling grooves and extend outwards to form a part, and the extending part of the side plate body is welded and fixed with the first side beam wrapping block and the second side beam wrapping block;

the platform floor comprises a bottom plate side beam, a bottom plate cross beam and a bottom plate longitudinal beam, wherein the bottom plate cross beam and the bottom plate longitudinal beam are connected within the bottom plate side beam, the bottom plate longitudinal beam and the bottom plate cross beam are connected to form a rectangular frame structure, a first bottom plate body and a second bottom plate body are arranged above the bottom plate cross beam and the bottom plate longitudinal beam, the bottom of the first bottom plate body is made of an aluminum alloy material in an integrated extrusion forming mode to form a reinforcing beam, the reinforcing beam is arranged in parallel with the bottom plate cross beam, a plurality of second bottom plate bodies are arranged between every two adjacent first bottom plate bodies, and the first bottom plate bodies and the second bottom plate bodies and the adjacent second bottom plate bodies are fixedly connected through friction welding.

2. The modular, lightweight boxcar having a reinforced floor as set forth in claim 1, wherein: the first bottom plate body and the cross section of the reinforcing beam are in a T-shaped structure, wherein the first bottom plate body forms the transverse part of the T-shaped structure, and the reinforcing beam forms the vertical part of the T-shaped structure.

3. The modular, lightweight boxcar having a reinforced floor as set forth in claim 2, wherein: the first bottom plate body and the second bottom plate body are both of double-layer aluminum plate structures, and a supporting wall is formed between the double-layer aluminum plates.

4. The modular, lightweight boxcar having a reinforced floor as set forth in claim 1, wherein: the first bottom plate body and the second bottom plate body are both of a multi-cavity structure.

5. The modular, lightweight boxcar having a reinforced floor as set forth in claim 1, wherein: the first side beam wrapping block comprises a vertical part, a first transverse part and a second transverse part, the first transverse part is connected to the top of the vertical part, the second transverse part is connected to the middle lower part of the vertical part, a buckling groove is formed between the first transverse part and the second transverse part and is buckled on the side edge of the carriage top plate, the first side beam wrapping block and the carriage top plate are buckled and then welded and fixed, the second transverse part is provided with the imitated groove, and the extending part of the side plate body is welded on one side, close to the first transverse part, of the second transverse part.

6. The modular, lightweight boxcar having a reinforced floor as set forth in claim 1, wherein: the second boundary beam package piece includes buckling parts and protection part, the buckling parts is used for the lock to be in bottom plate's side reason, welded fastening behind side carriage board and the bottom plate lock forms between buckling parts and the protection part the profile groove, the protruding part of curb plate body weld in the lower lateral wall of buckling parts, protection part locate in the carriage and support in on the protruding portion of bottom plate boundary beam for provide the impact force protection to the side carriage board.

7. The modular, lightweight boxcar having a reinforced floor as set forth in claim 6, wherein: the protection part comprises a plane part and an inclined part which are connected, the plane part is supported on the carriage bottom plate, the inclined part extends to the side carriage plate from the inner side of the plane part, a support strip is arranged between the inclined part and the side carriage plate, the free end of the support strip extends to be in contact with the side carriage plate, and the upper side edge of the inclined part is partially welded with the side carriage plate.

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